<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019cb454-9412-7e1f-891c-8222d7983e86,g:efdfd3bb-c6b6-4726-a69c-0c82b2e47a40-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.fg.com/role/Cover" xlink:type="simple" xlink:href="fg-20260331.xsd#Cover"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_019cb454-9b6d-7811-8316-c0845eea672c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_EntitiesTable_019cb454-9b6d-7811-8316-c0845eea672c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019cb454-9b6d-78c8-a249-c3bdf089b3c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_dei_EntitiesTable_019cb454-9b6d-7811-8316-c0845eea672c" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019cb454-9b6d-78c8-a249-c3bdf089b3c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb454-9b6d-78c8-a249-c3bdf089b3c7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019cb454-9b6d-78c8-a249-c3bdf089b3c7" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb454-9b6d-78c8-a249-c3bdf089b3c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb454-9b6d-747c-997e-0b6aa9e31cba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019cb454-9b6d-78c8-a249-c3bdf089b3c7" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb454-9b6d-747c-997e-0b6aa9e31cba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019cb454-9b6d-786b-a923-0a57d788f6f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019cb454-9b6d-747c-997e-0b6aa9e31cba" xlink:to="loc_us-gaap_CommonStockMember_019cb454-9b6d-786b-a923-0a57d788f6f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_A7.950SeniorNotesDue2053Member_019cb454-9b6d-7717-971e-0dfb344d39b1" xlink:href="fg-20260331.xsd#fg_A7.950SeniorNotesDue2053Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019cb454-9b6d-747c-997e-0b6aa9e31cba" xlink:to="loc_fg_A7.950SeniorNotesDue2053Member_019cb454-9b6d-7717-971e-0dfb344d39b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_A7.300JuniorSubordinatedNotesDue2065Member_019cb454-9b6d-77d5-9105-08cb1b5134db" xlink:href="fg-20260331.xsd#fg_A7.300JuniorSubordinatedNotesDue2065Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019cb454-9b6d-747c-997e-0b6aa9e31cba" xlink:to="loc_fg_A7.300JuniorSubordinatedNotesDue2065Member_019cb454-9b6d-77d5-9105-08cb1b5134db" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_019cb454-9b6d-7574-a83a-bf829e1476df" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentType"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_DocumentType_019cb454-9b6d-7574-a83a-bf829e1476df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentQuarterlyReport_019cb454-9b6d-76b0-8862-37d2d2961270" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentQuarterlyReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_DocumentQuarterlyReport_019cb454-9b6d-76b0-8862-37d2d2961270" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_019cb454-9b6d-729c-aa2c-34cafe3feec0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentPeriodEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_DocumentPeriodEndDate_019cb454-9b6d-729c-aa2c-34cafe3feec0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_019cb454-9b6d-7c1b-bcc3-f5a345b370fe" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentTransitionReport"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_DocumentTransitionReport_019cb454-9b6d-7c1b-bcc3-f5a345b370fe" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_019cb454-9b6d-7d95-aeb2-8adcc31a8806" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFileNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_EntityFileNumber_019cb454-9b6d-7d95-aeb2-8adcc31a8806" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_019cb454-9b6d-795b-ab56-a72c3af40286" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityRegistrantName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_EntityRegistrantName_019cb454-9b6d-795b-ab56-a72c3af40286" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_019cb454-9b6d-748d-9fc0-a6175a0c0b7b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_EntityIncorporationStateCountryCode_019cb454-9b6d-748d-9fc0-a6175a0c0b7b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_019cb454-9b6d-77a8-b8d6-209d94210b81" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_EntityTaxIdentificationNumber_019cb454-9b6d-77a8-b8d6-209d94210b81" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_019cb454-9b6d-7d93-bbcb-e8773cba2ca7" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_EntityAddressAddressLine1_019cb454-9b6d-7d93-bbcb-e8773cba2ca7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine2_019cb454-9b6d-7b1d-af4f-d08c9d303373" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressAddressLine2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_EntityAddressAddressLine2_019cb454-9b6d-7b1d-af4f-d08c9d303373" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_019cb454-9b6d-7f12-8215-951a6c96d285" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressCityOrTown"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_EntityAddressCityOrTown_019cb454-9b6d-7f12-8215-951a6c96d285" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressStateOrProvince_019cb454-9b6d-7d1b-bd21-fa1f561345b8" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressStateOrProvince"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_EntityAddressStateOrProvince_019cb454-9b6d-7d1b-bd21-fa1f561345b8" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_019cb454-9b6d-72fe-b36c-b88887c4d455" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityAddressPostalZipCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_EntityAddressPostalZipCode_019cb454-9b6d-72fe-b36c-b88887c4d455" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_019cb454-9b6d-719c-99a5-5987688a8845" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CityAreaCode"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_CityAreaCode_019cb454-9b6d-719c-99a5-5987688a8845" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_019cb454-9b6d-7ad2-9143-11c9a332b37e" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LocalPhoneNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_LocalPhoneNumber_019cb454-9b6d-7ad2-9143-11c9a332b37e" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_019cb454-9b6d-7aa2-8932-800e30e544cd" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_Security12bTitle"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_Security12bTitle_019cb454-9b6d-7aa2-8932-800e30e544cd" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_019cb454-9b6d-7349-b9b4-9dafc498c496" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_TradingSymbol"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_TradingSymbol_019cb454-9b6d-7349-b9b4-9dafc498c496" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_019cb454-9b6d-76a6-a4be-0f778857044c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_SecurityExchangeName"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_SecurityExchangeName_019cb454-9b6d-76a6-a4be-0f778857044c" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_019cb454-9b6d-740d-944a-de4b80c21b21" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCurrentReportingStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_EntityCurrentReportingStatus_019cb454-9b6d-740d-944a-de4b80c21b21" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_019cb454-9b6d-7961-801a-26c259e19b34" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_EntityInteractiveDataCurrent_019cb454-9b6d-7961-801a-26c259e19b34" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_019cb454-9b6d-775d-aece-e5b535702cd0" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityFilerCategory"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_EntityFilerCategory_019cb454-9b6d-775d-aece-e5b535702cd0" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_019cb454-9b6d-7abb-98c3-692f0d859f12" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntitySmallBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_EntitySmallBusiness_019cb454-9b6d-7abb-98c3-692f0d859f12" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_019cb454-9b6d-71cf-b55b-969a02939393" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_EntityEmergingGrowthCompany_019cb454-9b6d-71cf-b55b-969a02939393" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_019cb454-9b6d-746e-9a9f-84d5f8377e0c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityShellCompany"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_EntityShellCompany_019cb454-9b6d-746e-9a9f-84d5f8377e0c" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_019cb454-9b6d-7bdf-bb0b-a85ab7e8ff7d" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_019cb454-9b6d-7bdf-bb0b-a85ab7e8ff7d" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_019cb454-9b6d-723e-81e9-4512eb511d97" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_AmendmentFlag"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_AmendmentFlag_019cb454-9b6d-723e-81e9-4512eb511d97" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_019cb454-9b6d-7c9a-9e4e-0824421f056c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalYearFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_DocumentFiscalYearFocus_019cb454-9b6d-7c9a-9e4e-0824421f056c" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_019cb454-9b6d-76ba-926c-892c849a6368" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_DocumentFiscalPeriodFocus_019cb454-9b6d-76ba-926c-892c849a6368" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_019cb454-9b6d-7df6-8b6e-0e0a873bd868" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityCentralIndexKey"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_EntityCentralIndexKey_019cb454-9b6d-7df6-8b6e-0e0a873bd868" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_019cb454-9b6d-766f-afa5-f64c3f71253f" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityInformationLineItems_019cb454-9b6d-7c3e-a2ea-fd89b3fc8e01" xlink:to="loc_dei_CurrentFiscalYearEndDate_019cb454-9b6d-766f-afa5-f64c3f71253f" xlink:type="arc" order="29"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="simple" xlink:href="fg-20260331.xsd#CONDENSEDCONSOLIDATEDBALANCESHEETS"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETS" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019cb454-9b6d-74d1-bacb-50bb25814995" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019cb454-9b6d-757b-bc1b-deb5589238d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019cb454-9b6d-74d1-bacb-50bb25814995" xlink:to="loc_us-gaap_StatementTable_019cb454-9b6d-757b-bc1b-deb5589238d4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019cb454-9b6d-7d61-a96d-7fc70e2602c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019cb454-9b6d-757b-bc1b-deb5589238d4" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019cb454-9b6d-7d61-a96d-7fc70e2602c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-7d61-a96d-7fc70e2602c7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cb454-9b6d-7d61-a96d-7fc70e2602c7" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-7d61-a96d-7fc70e2602c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-7f37-b821-7bb9d657e1dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cb454-9b6d-7d61-a96d-7fc70e2602c7" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-7f37-b821-7bb9d657e1dc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_019cb454-9b6d-719b-ad28-c58e3505e101" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-7f37-b821-7bb9d657e1dc" xlink:to="loc_us-gaap_PreferredStockMember_019cb454-9b6d-719b-ad28-c58e3505e101" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019cb454-9b6d-7a27-9ace-3a32a7704436" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019cb454-9b6d-74d1-bacb-50bb25814995" xlink:to="loc_us-gaap_AssetsAbstract_019cb454-9b6d-7a27-9ace-3a32a7704436" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentsAbstract_019cb454-9b6d-7091-92f6-62734537a2a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9b6d-7a27-9ace-3a32a7704436" xlink:to="loc_us-gaap_InvestmentsAbstract_019cb454-9b6d-7091-92f6-62734537a2a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019cb454-9b6d-7ae4-a1a5-6133876b035f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_019cb454-9b6d-7091-92f6-62734537a2a1" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019cb454-9b6d-7ae4-a1a5-6133876b035f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FixedMaturitySecuritiesAtFairValueUnderFairValueOption_019dfb2b-9be0-760d-8d29-a4e6853790d8" xlink:href="fg-20260331.xsd#fg_FixedMaturitySecuritiesAtFairValueUnderFairValueOption"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_019cb454-9b6d-7091-92f6-62734537a2a1" xlink:to="loc_fg_FixedMaturitySecuritiesAtFairValueUnderFairValueOption_019dfb2b-9be0-760d-8d29-a4e6853790d8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_019cb454-9b6d-7c31-aa47-18f3e1cd3e4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNi"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_019cb454-9b6d-7091-92f6-62734537a2a1" xlink:to="loc_us-gaap_EquitySecuritiesFvNi_019cb454-9b6d-7c31-aa47-18f3e1cd3e4f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019cb454-9b6d-7f0d-8f14-52daeafd9ad9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_019cb454-9b6d-7091-92f6-62734537a2a1" xlink:to="loc_us-gaap_DerivativeAssets_019cb454-9b6d-7f0d-8f14-52daeafd9ad9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019cb454-9b6d-7fa3-82af-ad38755ba8d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_019cb454-9b6d-7091-92f6-62734537a2a1" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019cb454-9b6d-7fa3-82af-ad38755ba8d5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_019cb454-9b6d-7215-af63-8e776d96900e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_019cb454-9b6d-7091-92f6-62734537a2a1" xlink:to="loc_us-gaap_EquityMethodInvestments_019cb454-9b6d-7215-af63-8e776d96900e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermInvestments_019cb454-9b6d-7b29-9267-996f2974993c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLongTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_019cb454-9b6d-7091-92f6-62734537a2a1" xlink:to="loc_us-gaap_OtherLongTermInvestments_019cb454-9b6d-7b29-9267-996f2974993c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansInsurancePolicy_019cb454-9b6d-74ce-98ec-7b6ea356e656" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansInsurancePolicy"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_019cb454-9b6d-7091-92f6-62734537a2a1" xlink:to="loc_us-gaap_LoansInsurancePolicy_019cb454-9b6d-74ce-98ec-7b6ea356e656" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherShortTermInvestments_019cb454-9b6d-71fd-a6a1-50be3286dadb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_019cb454-9b6d-7091-92f6-62734537a2a1" xlink:to="loc_us-gaap_OtherShortTermInvestments_019cb454-9b6d-71fd-a6a1-50be3286dadb" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_019cb454-9b6d-7450-8c4c-901a6d4b420c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Investments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentsAbstract_019cb454-9b6d-7091-92f6-62734537a2a1" xlink:to="loc_us-gaap_Investments_019cb454-9b6d-7450-8c4c-901a6d4b420c" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019cb454-9b6d-79bc-8dce-621eb86bbc35" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9b6d-7a27-9ace-3a32a7704436" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019cb454-9b6d-79bc-8dce-621eb86bbc35" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverables_019cb454-9b6d-7863-b9db-bc64e93c6d98" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReinsuranceRecoverables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9b6d-7a27-9ace-3a32a7704436" xlink:to="loc_us-gaap_ReinsuranceRecoverables_019cb454-9b6d-7863-b9db-bc64e93c6d98" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_019cb454-9b6d-7f36-83e2-4e3bbd5fde6d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9b6d-7a27-9ace-3a32a7704436" xlink:to="loc_us-gaap_Goodwill_019cb454-9b6d-7f36-83e2-4e3bbd5fde6d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssets_019cb454-9b6d-73f7-a33f-336fb4b66bff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrepaidExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9b6d-7a27-9ace-3a32a7704436" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssets_019cb454-9b6d-73f7-a33f-336fb4b66bff" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsNet_019cb454-9b6d-794e-b94a-e456c7a5a2d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9b6d-7a27-9ace-3a32a7704436" xlink:to="loc_us-gaap_OtherIntangibleAssetsNet_019cb454-9b6d-794e-b94a-e456c7a5a2d6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAssetAmount_019cb454-9b6d-7e8b-ae4d-0d5223f8d18d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitAssetAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9b6d-7a27-9ace-3a32a7704436" xlink:to="loc_us-gaap_MarketRiskBenefitAssetAmount_019cb454-9b6d-7e8b-ae4d-0d5223f8d18d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxReceivable_019cb454-9b6d-7f78-81e3-1be47c00d5c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9b6d-7a27-9ace-3a32a7704436" xlink:to="loc_us-gaap_IncomeTaxReceivable_019cb454-9b6d-7f78-81e3-1be47c00d5c6" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_019cb454-9b6d-7300-ad13-eae06d86bffd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9b6d-7a27-9ace-3a32a7704436" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_019cb454-9b6d-7300-ad13-eae06d86bffd" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019cb454-9b6d-73fa-a7ae-23c510526e66" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9b6d-7a27-9ace-3a32a7704436" xlink:to="loc_us-gaap_Assets_019cb454-9b6d-73fa-a7ae-23c510526e66" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019cb454-9b6d-7b47-8514-0be4856594f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019cb454-9b6d-74d1-bacb-50bb25814995" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019cb454-9b6d-7b47-8514-0be4856594f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_019cb454-9b6d-75d4-90c0-f1b8a4417250" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019cb454-9b6d-7b47-8514-0be4856594f2" xlink:to="loc_us-gaap_LiabilitiesAbstract_019cb454-9b6d-75d4-90c0-f1b8a4417250" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderFunds_019cb454-9b6d-7a59-95b6-b671c3d2c23c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019cb454-9b6d-75d4-90c0-f1b8a4417250" xlink:to="loc_us-gaap_PolicyholderFunds_019cb454-9b6d-7a59-95b6-b671c3d2c23c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefits_019cb454-9b6d-7158-a285-0f06044e87d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019cb454-9b6d-75d4-90c0-f1b8a4417250" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefits_019cb454-9b6d-7158-a285-0f06044e87d4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitLiabilityAmount_019cb454-9b6d-7baf-a304-3e7264a2c442" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitLiabilityAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019cb454-9b6d-75d4-90c0-f1b8a4417250" xlink:to="loc_us-gaap_MarketRiskBenefitLiabilityAmount_019cb454-9b6d-7baf-a304-3e7264a2c442" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_019cb454-9b6d-754f-af6e-4d2f2fc29a7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019cb454-9b6d-75d4-90c0-f1b8a4417250" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent_019cb454-9b6d-754f-af6e-4d2f2fc29a7c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019cb454-9b6d-745d-bbba-83500c546278" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019cb454-9b6d-75d4-90c0-f1b8a4417250" xlink:to="loc_us-gaap_LongTermDebt_019cb454-9b6d-745d-bbba-83500c546278" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FundsHeldUnderReinsuranceAgreementsLiability_019cb454-9b6d-723e-9226-0f04bc72f81e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FundsHeldUnderReinsuranceAgreementsLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019cb454-9b6d-75d4-90c0-f1b8a4417250" xlink:to="loc_us-gaap_FundsHeldUnderReinsuranceAgreementsLiability_019cb454-9b6d-723e-9226-0f04bc72f81e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_019cb454-9b6d-7701-bfcf-ff2916ce15b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019cb454-9b6d-75d4-90c0-f1b8a4417250" xlink:to="loc_us-gaap_Liabilities_019cb454-9b6d-7701-bfcf-ff2916ce15b4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_019cb454-9b6d-71fe-8f4e-18b67d34c0a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019cb454-9b6d-7b47-8514-0be4856594f2" xlink:to="loc_us-gaap_EquityAbstract_019cb454-9b6d-71fe-8f4e-18b67d34c0a8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockValue_019cb454-9b6d-773a-8751-a060f1f0e46f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_019cb454-9b6d-71fe-8f4e-18b67d34c0a8" xlink:to="loc_us-gaap_PreferredStockValue_019cb454-9b6d-773a-8751-a060f1f0e46f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_019cb454-9b6d-754b-9465-e3e9516c8b1a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_019cb454-9b6d-71fe-8f4e-18b67d34c0a8" xlink:to="loc_us-gaap_CommonStockValue_019cb454-9b6d-754b-9465-e3e9516c8b1a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_019cb454-9b6d-73b2-9210-a4f302eb9bc3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_019cb454-9b6d-71fe-8f4e-18b67d34c0a8" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_019cb454-9b6d-73b2-9210-a4f302eb9bc3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019cb454-9b6d-7b87-9f32-a5f082fa191a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_019cb454-9b6d-71fe-8f4e-18b67d34c0a8" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_019cb454-9b6d-7b87-9f32-a5f082fa191a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019cb454-9b6d-73fa-898f-7a5daf23ebda" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_019cb454-9b6d-71fe-8f4e-18b67d34c0a8" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_019cb454-9b6d-73fa-898f-7a5daf23ebda" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValue_019cb454-9b6d-70d3-b95a-f09513ebbc80" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_019cb454-9b6d-71fe-8f4e-18b67d34c0a8" xlink:to="loc_us-gaap_TreasuryStockValue_019cb454-9b6d-70d3-b95a-f09513ebbc80" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_019cb454-9b6d-74d0-a832-823a80d2c25f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_019cb454-9b6d-71fe-8f4e-18b67d34c0a8" xlink:to="loc_us-gaap_StockholdersEquity_019cb454-9b6d-74d0-a832-823a80d2c25f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_019cb454-9b6d-7507-b84f-81c1fe168d09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_019cb454-9b6d-71fe-8f4e-18b67d34c0a8" xlink:to="loc_us-gaap_MinorityInterest_019cb454-9b6d-7507-b84f-81c1fe168d09" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019cb454-9b6d-7f87-aee1-fc4c3e612909" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityAbstract_019cb454-9b6d-71fe-8f4e-18b67d34c0a8" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019cb454-9b6d-7f87-aee1-fc4c3e612909" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_019cb454-9b6d-7d23-955f-73e774022c03" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_019cb454-9b6d-7b47-8514-0be4856594f2" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_019cb454-9b6d-7d23-955f-73e774022c03" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical" xlink:type="simple" xlink:href="fg-20260331.xsd#CONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/CONDENSEDCONSOLIDATEDBALANCESHEETSParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019dc391-4624-7051-a2af-1491c8de0fda" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019dc391-4624-78d4-9d38-32894ac2511b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019dc391-4624-7051-a2af-1491c8de0fda" xlink:to="loc_us-gaap_StatementTable_019dc391-4624-78d4-9d38-32894ac2511b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019dc391-4624-79ef-94ec-670d71931cd0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019dc391-4624-78d4-9d38-32894ac2511b" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019dc391-4624-79ef-94ec-670d71931cd0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019dc391-4624-79ef-94ec-670d71931cd0_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019dc391-4624-79ef-94ec-670d71931cd0" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019dc391-4624-79ef-94ec-670d71931cd0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019dc391-4624-79f0-a921-354445fbb86c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019dc391-4624-79ef-94ec-670d71931cd0" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019dc391-4624-79f0-a921-354445fbb86c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019dc391-4624-7fc8-854b-6f4f2ba58265" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019dc391-4624-79f0-a921-354445fbb86c" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019dc391-4624-7fc8-854b-6f4f2ba58265" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_019cb454-9b6d-7bc0-8907-a888df4913ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dc391-4624-7051-a2af-1491c8de0fda" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_019cb454-9b6d-7bc0-8907-a888df4913ef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss_019cb454-9b6d-7cb7-87a4-f6b2c2057fca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dc391-4624-7051-a2af-1491c8de0fda" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss_019cb454-9b6d-7cb7-87a4-f6b2c2057fca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019cb454-9b6d-75a0-aefd-37890158fd62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dc391-4624-7051-a2af-1491c8de0fda" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019cb454-9b6d-75a0-aefd-37890158fd62" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_019dc391-4624-709b-9aea-b06adab2bb52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dc391-4624-7051-a2af-1491c8de0fda" xlink:to="loc_us-gaap_EquityMethodInvestments_019dc391-4624-709b-9aea-b06adab2bb52" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentsFairValueDisclosure_019dc395-2f04-7c8f-88c9-ff7aa96c41fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dc391-4624-7051-a2af-1491c8de0fda" xlink:to="loc_us-gaap_EquityMethodInvestmentsFairValueDisclosure_019dc395-2f04-7c8f-88c9-ff7aa96c41fb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermInvestments_019dc396-2532-7cd3-8b1b-c270681180a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLongTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dc391-4624-7051-a2af-1491c8de0fda" xlink:to="loc_us-gaap_OtherLongTermInvestments_019dc396-2532-7cd3-8b1b-c270681180a8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestments_019dc396-2532-7c2b-8303-7412430c6953" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dc391-4624-7051-a2af-1491c8de0fda" xlink:to="loc_us-gaap_ShortTermInvestments_019dc396-2532-7c2b-8303-7412430c6953" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019dc396-2532-7d1b-8232-f5b19d15ce23" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dc391-4624-7051-a2af-1491c8de0fda" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019dc396-2532-7d1b-8232-f5b19d15ce23" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverablesAllowance_019cb454-9b6d-7633-878e-192f0850a688" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReinsuranceRecoverablesAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dc391-4624-7051-a2af-1491c8de0fda" xlink:to="loc_us-gaap_ReinsuranceRecoverablesAllowance_019cb454-9b6d-7633-878e-192f0850a688" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableFairValueDisclosure_019cb454-9b6d-7472-8ad7-63418e05e0dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesReceivableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dc391-4624-7051-a2af-1491c8de0fda" xlink:to="loc_us-gaap_NotesReceivableFairValueDisclosure_019cb454-9b6d-7472-8ad7-63418e05e0dc" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_019cb454-9b6d-7b85-80bc-dcd4f1aa90f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dc391-4624-7051-a2af-1491c8de0fda" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_019cb454-9b6d-7b85-80bc-dcd4f1aa90f7" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_019cb454-9b6d-792e-97d4-ea1c074a341b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dc391-4624-7051-a2af-1491c8de0fda" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_019cb454-9b6d-792e-97d4-ea1c074a341b" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesIssued_019cb454-9b6d-791b-9dec-ea2414b5c63b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dc391-4624-7051-a2af-1491c8de0fda" xlink:to="loc_us-gaap_PreferredStockSharesIssued_019cb454-9b6d-791b-9dec-ea2414b5c63b" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockSharesOutstanding_019cb454-9b6d-7be5-b7ea-9146adc2c867" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dc391-4624-7051-a2af-1491c8de0fda" xlink:to="loc_us-gaap_PreferredStockSharesOutstanding_019cb454-9b6d-7be5-b7ea-9146adc2c867" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_019cb454-9b6d-7a30-8632-5d8dc70fd8d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dc391-4624-7051-a2af-1491c8de0fda" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_019cb454-9b6d-7a30-8632-5d8dc70fd8d8" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_019cb454-9b6d-7dc0-9069-e35d522853c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dc391-4624-7051-a2af-1491c8de0fda" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_019cb454-9b6d-7dc0-9069-e35d522853c6" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_019cb454-9b6d-7b7f-8cfe-37ba6b591e12" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dc391-4624-7051-a2af-1491c8de0fda" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_019cb454-9b6d-7b7f-8cfe-37ba6b591e12" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_019cb454-9b6d-7d3a-a6c4-9f384242bbc8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dc391-4624-7051-a2af-1491c8de0fda" xlink:to="loc_us-gaap_CommonStockSharesIssued_019cb454-9b6d-7d3a-a6c4-9f384242bbc8" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_019dc3c7-801b-7d6e-9faf-2811c1146ec7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019dc391-4624-7051-a2af-1491c8de0fda" xlink:to="loc_us-gaap_TreasuryStockCommonShares_019dc3c7-801b-7d6e-9faf-2811c1146ec7" xlink:type="arc" order="18"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" xlink:type="simple" xlink:href="fg-20260331.xsd#CONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/CONDENSEDCONSOLIDATEDSTATEMENTSOFEQUITY" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_019cb454-9b6d-7b56-8a81-0132fbafe839" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_019cb454-9b6d-77e2-998b-776997298f98" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_019cb454-9b6d-7b56-8a81-0132fbafe839" xlink:to="loc_us-gaap_StatementTable_019cb454-9b6d-77e2-998b-776997298f98" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019cb454-9b6d-7400-8bc4-4630b31896ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019cb454-9b6d-77e2-998b-776997298f98" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019cb454-9b6d-7400-8bc4-4630b31896ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019cb454-9b6d-7400-8bc4-4630b31896ea_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019cb454-9b6d-7400-8bc4-4630b31896ea" xlink:to="loc_us-gaap_EquityComponentDomain_019cb454-9b6d-7400-8bc4-4630b31896ea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019cb454-9b6d-7606-9a26-1ce7144cbf38" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019cb454-9b6d-7400-8bc4-4630b31896ea" xlink:to="loc_us-gaap_EquityComponentDomain_019cb454-9b6d-7606-9a26-1ce7144cbf38" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_019cb454-9b6d-7ef6-be0f-e0bff2d1b0bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cb454-9b6d-7606-9a26-1ce7144cbf38" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_019cb454-9b6d-7ef6-be0f-e0bff2d1b0bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_019cb454-9b6d-7026-826f-a7dced9737bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cb454-9b6d-7606-9a26-1ce7144cbf38" xlink:to="loc_us-gaap_RetainedEarningsMember_019cb454-9b6d-7026-826f-a7dced9737bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019cb454-9b6d-7912-8c8d-0c42219aa52d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cb454-9b6d-7606-9a26-1ce7144cbf38" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019cb454-9b6d-7912-8c8d-0c42219aa52d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_019cb454-9b6d-723f-95d0-492237b9f120" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cb454-9b6d-7606-9a26-1ce7144cbf38" xlink:to="loc_us-gaap_TreasuryStockCommonMember_019cb454-9b6d-723f-95d0-492237b9f120" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_019cb454-9b6d-7683-9cc1-c8dea20719a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cb454-9b6d-7606-9a26-1ce7144cbf38" xlink:to="loc_us-gaap_NoncontrollingInterestMember_019cb454-9b6d-7683-9cc1-c8dea20719a2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019cb454-9b6d-7403-bf21-4f395219bcee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_019cb454-9b6d-77e2-998b-776997298f98" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019cb454-9b6d-7403-bf21-4f395219bcee" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb454-9b6d-7403-bf21-4f395219bcee_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019cb454-9b6d-7403-bf21-4f395219bcee" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb454-9b6d-7403-bf21-4f395219bcee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb454-9b6d-781c-abbd-9f6d9d4773f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019cb454-9b6d-7403-bf21-4f395219bcee" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb454-9b6d-781c-abbd-9f6d9d4773f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019cb454-9b6d-7e76-b769-5e0c412bb634" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019cb454-9b6d-781c-abbd-9f6d9d4773f5" xlink:to="loc_us-gaap_CommonStockMember_019cb454-9b6d-7e76-b769-5e0c412bb634" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cb454-9b6d-79e9-b3fd-c38300d107c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_019cb454-9b6d-7b56-8a81-0132fbafe839" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cb454-9b6d-79e9-b3fd-c38300d107c4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019cb454-9b6d-70d8-ada9-3ea500fc14ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cb454-9b6d-79e9-b3fd-c38300d107c4" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019cb454-9b6d-70d8-ada9-3ea500fc14ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019cb454-9b6d-76d4-9e29-c3ff97062a61" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cb454-9b6d-79e9-b3fd-c38300d107c4" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019cb454-9b6d-76d4-9e29-c3ff97062a61" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019cb454-9b6d-7cad-b837-ed163926c58e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cb454-9b6d-79e9-b3fd-c38300d107c4" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_019cb454-9b6d-7cad-b837-ed163926c58e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019cb454-9b6d-7070-9b3e-048a038b35f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cb454-9b6d-79e9-b3fd-c38300d107c4" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_019cb454-9b6d-7070-9b3e-048a038b35f9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPreferredStockCash_019cb454-9b6d-7218-b393-577a1868856c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsPreferredStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cb454-9b6d-79e9-b3fd-c38300d107c4" xlink:to="loc_us-gaap_DividendsPreferredStockCash_019cb454-9b6d-7218-b393-577a1868856c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_019cb454-9b6d-7612-a952-8cb40f63637b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsCommonStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cb454-9b6d-79e9-b3fd-c38300d107c4" xlink:to="loc_us-gaap_DividendsCommonStockCash_019cb454-9b6d-7612-a952-8cb40f63637b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_019cb454-9b6d-7f77-bf55-7b064ca2990b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cb454-9b6d-79e9-b3fd-c38300d107c4" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_019cb454-9b6d-7f77-bf55-7b064ca2990b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019cb454-9b6d-7295-b6f0-de529a2d0949" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cb454-9b6d-79e9-b3fd-c38300d107c4" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_019cb454-9b6d-7295-b6f0-de529a2d0949" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019cb454-9b6d-75b8-a229-55c47f6c90a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_019cb454-9b6d-79e9-b3fd-c38300d107c4" xlink:to="loc_us-gaap_ProfitLoss_019cb454-9b6d-75b8-a229-55c47f6c90a0" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019cb454-9b6d-7874-a6cb-be165dbea3e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/BasisofFinancialStatementsRecentDevelopmentsDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#BasisofFinancialStatementsRecentDevelopmentsDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/BasisofFinancialStatementsRecentDevelopmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019cb454-9b6d-768b-b39c-ed4e48d7d6a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019cb454-9b6d-7064-b27c-0a0c2261f118" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9b6d-768b-b39c-ed4e48d7d6a6" xlink:to="loc_us-gaap_DebtInstrumentTable_019cb454-9b6d-7064-b27c-0a0c2261f118" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019d496d-2f5a-75a0-8365-45b1e9c89ac7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cb454-9b6d-7064-b27c-0a0c2261f118" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019d496d-2f5a-75a0-8365-45b1e9c89ac7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019d496d-2f5a-75a0-8365-45b1e9c89ac7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019d496d-2f5a-75a0-8365-45b1e9c89ac7" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019d496d-2f5a-75a0-8365-45b1e9c89ac7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019d496d-2f5a-7c60-bc47-f50eb75f3975" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019d496d-2f5a-75a0-8365-45b1e9c89ac7" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019d496d-2f5a-7c60-bc47-f50eb75f3975" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019d496d-2f5a-77eb-9fe5-7692f841aec0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019d496d-2f5a-7c60-bc47-f50eb75f3975" xlink:to="loc_us-gaap_SubsequentEventMember_019d496d-2f5a-77eb-9fe5-7692f841aec0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019d496d-aba7-7cc2-8a30-7e5680fff754" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cb454-9b6d-7064-b27c-0a0c2261f118" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019d496d-aba7-7cc2-8a30-7e5680fff754" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_019d496d-aba7-7cc2-8a30-7e5680fff754_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019d496d-aba7-7cc2-8a30-7e5680fff754" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_019d496d-aba7-7cc2-8a30-7e5680fff754_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_019d496d-aba7-7aa6-a244-4fce66e9d642" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019d496d-aba7-7cc2-8a30-7e5680fff754" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_019d496d-aba7-7aa6-a244-4fce66e9d642" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DistributionInvestmentsAndAffiliatesMember_019d496d-aba7-7a06-8167-8c84e90e9ebf" xlink:href="fg-20260331.xsd#fg_DistributionInvestmentsAndAffiliatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_019d496d-aba7-7aa6-a244-4fce66e9d642" xlink:to="loc_fg_DistributionInvestmentsAndAffiliatesMember_019d496d-aba7-7a06-8167-8c84e90e9ebf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_019d496d-aba7-7d2e-a4f5-b6054d26c681" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cb454-9b6d-7064-b27c-0a0c2261f118" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_019d496d-aba7-7d2e-a4f5-b6054d26c681" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019d496d-aba7-7d2e-a4f5-b6054d26c681_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019d496d-aba7-7d2e-a4f5-b6054d26c681" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019d496d-aba7-7d2e-a4f5-b6054d26c681_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_019d496d-aba7-7726-9b07-2854efaf6877" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_019d496d-aba7-7d2e-a4f5-b6054d26c681" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_019d496d-aba7-7726-9b07-2854efaf6877" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_CommissionFeesPaidMember_019d496d-aba7-7e81-aa68-261eb8ba0122" xlink:href="fg-20260331.xsd#fg_CommissionFeesPaidMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_019d496d-aba7-7726-9b07-2854efaf6877" xlink:to="loc_fg_CommissionFeesPaidMember_019d496d-aba7-7e81-aa68-261eb8ba0122" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_019d49a5-e9fe-7afd-9d06-adeaf2669573" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cb454-9b6d-7064-b27c-0a0c2261f118" xlink:to="loc_srt_OwnershipAxis_019d49a5-e9fe-7afd-9d06-adeaf2669573" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_019d49a5-e9fe-7afd-9d06-adeaf2669573_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_019d49a5-e9fe-7afd-9d06-adeaf2669573" xlink:to="loc_srt_OwnershipDomain_019d49a5-e9fe-7afd-9d06-adeaf2669573_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_019d49a5-e9fe-735e-bd84-619337238c05" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_019d49a5-e9fe-7afd-9d06-adeaf2669573" xlink:to="loc_srt_OwnershipDomain_019d49a5-e9fe-735e-bd84-619337238c05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_AncientFinancialHoldingsLPMember_019d8705-bfc2-7e29-9346-53e3433ab500" xlink:href="fg-20260331.xsd#fg_AncientFinancialHoldingsLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_019d49a5-e9fe-735e-bd84-619337238c05" xlink:to="loc_fg_AncientFinancialHoldingsLPMember_019d8705-bfc2-7e29-9346-53e3433ab500" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019d8704-4843-7525-838f-056932eea066" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cb454-9b6d-7064-b27c-0a0c2261f118" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019d8704-4843-7525-838f-056932eea066" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019d8704-4843-7525-838f-056932eea066_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019d8704-4843-7525-838f-056932eea066" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019d8704-4843-7525-838f-056932eea066_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019d8704-4843-7bd3-a084-2caad46ff103" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019d8704-4843-7525-838f-056932eea066" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019d8704-4843-7bd3-a084-2caad46ff103" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_AncientFinancialHoldingsLPMember_019d8704-b05c-7042-b875-35fd71b6755b" xlink:href="fg-20260331.xsd#fg_AncientFinancialHoldingsLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019d8704-4843-7bd3-a084-2caad46ff103" xlink:to="loc_fg_AncientFinancialHoldingsLPMember_019d8704-b05c-7042-b875-35fd71b6755b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramAxis_019d8727-1ab9-7411-8ccf-70f51f85f96e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cb454-9b6d-7064-b27c-0a0c2261f118" xlink:to="loc_srt_ShareRepurchaseProgramAxis_019d8727-1ab9-7411-8ccf-70f51f85f96e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019d8727-1ab9-7411-8ccf-70f51f85f96e_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019d8727-1ab9-7411-8ccf-70f51f85f96e" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019d8727-1ab9-7411-8ccf-70f51f85f96e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ShareRepurchaseProgramDomain_019d8727-1ab9-74f3-8620-1e83010841bf" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ShareRepurchaseProgramAxis_019d8727-1ab9-7411-8ccf-70f51f85f96e" xlink:to="loc_srt_ShareRepurchaseProgramDomain_019d8727-1ab9-74f3-8620-1e83010841bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ShareRepurchaseProgramMember_019d8727-f6dd-706e-b3ca-3c873d6d3481" xlink:href="fg-20260331.xsd#fg_ShareRepurchaseProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ShareRepurchaseProgramDomain_019d8727-1ab9-74f3-8620-1e83010841bf" xlink:to="loc_fg_ShareRepurchaseProgramMember_019d8727-f6dd-706e-b3ca-3c873d6d3481" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019d8728-261f-789e-a35e-33edf140d140" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cb454-9b6d-7064-b27c-0a0c2261f118" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019d8728-261f-789e-a35e-33edf140d140" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019d8728-261f-789e-a35e-33edf140d140_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019d8728-261f-789e-a35e-33edf140d140" xlink:to="loc_us-gaap_EquityComponentDomain_019d8728-261f-789e-a35e-33edf140d140_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019d8728-261f-7777-8dde-da2b8fe9b841" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019d8728-261f-789e-a35e-33edf140d140" xlink:to="loc_us-gaap_EquityComponentDomain_019d8728-261f-7777-8dde-da2b8fe9b841" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019d8728-47b8-7d6a-a94b-c4887e9d1dd6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019d8728-261f-7777-8dde-da2b8fe9b841" xlink:to="loc_us-gaap_CommonStockMember_019d8728-47b8-7d6a-a94b-c4887e9d1dd6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019de219-2bc4-7d7a-8be0-de4a899cb0d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cb454-9b6d-7064-b27c-0a0c2261f118" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019de219-2bc4-7d7a-8be0-de4a899cb0d1" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019de219-2bc4-7d7a-8be0-de4a899cb0d1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019de219-2bc4-7d7a-8be0-de4a899cb0d1" xlink:to="loc_us-gaap_SegmentDomain_019de219-2bc4-7d7a-8be0-de4a899cb0d1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019de219-2bc4-79a7-9769-3711bf24f8b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019de219-2bc4-7d7a-8be0-de4a899cb0d1" xlink:to="loc_us-gaap_SegmentDomain_019de219-2bc4-79a7-9769-3711bf24f8b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FAndGSegmentMember_019de219-2bc4-7b8f-9ae8-c89382885be9" xlink:href="fg-20260331.xsd#fg_FAndGSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019de219-2bc4-79a7-9769-3711bf24f8b3" xlink:to="loc_fg_FAndGSegmentMember_019de219-2bc4-7b8f-9ae8-c89382885be9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019de219-2bc4-727f-8864-b5e888d556a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cb454-9b6d-7064-b27c-0a0c2261f118" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019de219-2bc4-727f-8864-b5e888d556a0" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019de219-2bc4-727f-8864-b5e888d556a0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019de219-2bc4-727f-8864-b5e888d556a0" xlink:to="loc_us-gaap_ClassOfStockDomain_019de219-2bc4-727f-8864-b5e888d556a0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019de219-2bc4-7bb1-b966-dcf70b04d931" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019de219-2bc4-727f-8864-b5e888d556a0" xlink:to="loc_us-gaap_ClassOfStockDomain_019de219-2bc4-7bb1-b966-dcf70b04d931" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_A6.875SeriesAMandatoryConvertiblePreferredStockMember_019de219-2bc4-781c-bb74-0d9e0ce87c8c" xlink:href="fg-20260331.xsd#fg_A6.875SeriesAMandatoryConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019de219-2bc4-7bb1-b966-dcf70b04d931" xlink:to="loc_fg_A6.875SeriesAMandatoryConvertiblePreferredStockMember_019de219-2bc4-781c-bb74-0d9e0ce87c8c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ShareRepurchaseProgramTerm_019d8724-36a6-77b0-934b-e55173a6c2ee" xlink:href="fg-20260331.xsd#fg_ShareRepurchaseProgramTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9b6d-768b-b39c-ed4e48d7d6a6" xlink:to="loc_fg_ShareRepurchaseProgramTerm_019d8724-36a6-77b0-934b-e55173a6c2ee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019d496c-ec8e-78d4-945a-fdf7a8e8ed98" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9b6d-768b-b39c-ed4e48d7d6a6" xlink:to="loc_srt_StockRepurchaseProgramAuthorizedAmount1_019d496c-ec8e-78d4-945a-fdf7a8e8ed98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_019d496c-ec8e-70d1-a771-a5f9d5b54af7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9b6d-768b-b39c-ed4e48d7d6a6" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_019d496c-ec8e-70d1-a771-a5f9d5b54af7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019d496c-ec8e-787d-acc6-9d8de49709ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9b6d-768b-b39c-ed4e48d7d6a6" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_019d496c-ec8e-787d-acc6-9d8de49709ed" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_019d496c-ec8e-78c6-a77b-b45dc997bc85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockAcquiredAverageCostPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9b6d-768b-b39c-ed4e48d7d6a6" xlink:to="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_019d496c-ec8e-78c6-a77b-b45dc997bc85" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_019d496d-2f5a-7760-9892-e7546ec70f68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9b6d-768b-b39c-ed4e48d7d6a6" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_019d496d-2f5a-7760-9892-e7546ec70f68" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_019d496d-2f5a-788e-a898-67c42060d677" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9b6d-768b-b39c-ed4e48d7d6a6" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners_019d496d-2f5a-788e-a898-67c42060d677" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfBusiness_019d496d-2f5a-7303-bf40-db57ce2791a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnSaleOfBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9b6d-768b-b39c-ed4e48d7d6a6" xlink:to="loc_us-gaap_GainLossOnSaleOfBusiness_019d496d-2f5a-7303-bf40-db57ce2791a2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_019d496d-2f5a-76d4-982d-5eb2b59374c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9b6d-768b-b39c-ed4e48d7d6a6" xlink:to="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_019d496d-2f5a-76d4-982d-5eb2b59374c0" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsPerShareDeclared_019d496d-2f5a-7834-90a0-33d56a7e1279" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockDividendsPerShareDeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9b6d-768b-b39c-ed4e48d7d6a6" xlink:to="loc_us-gaap_PreferredStockDividendsPerShareDeclared_019d496d-2f5a-7834-90a0-33d56a7e1279" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendRatePercentage_019de219-2bc4-7c1c-9cb4-40884955dba5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockDividendRatePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9b6d-768b-b39c-ed4e48d7d6a6" xlink:to="loc_us-gaap_PreferredStockDividendRatePercentage_019de219-2bc4-7c1c-9cb4-40884955dba5" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_019de219-2bc4-727d-a9ec-46260db5ca9a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9b6d-768b-b39c-ed4e48d7d6a6" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_019de219-2bc4-727d-a9ec-46260db5ca9a" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockLiquidationPreference_019de219-2bc4-7d4f-9ff4-5e7390fe0ab4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockLiquidationPreference"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9b6d-768b-b39c-ed4e48d7d6a6" xlink:to="loc_us-gaap_PreferredStockLiquidationPreference_019de219-2bc4-7d4f-9ff4-5e7390fe0ab4" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_019d496d-2f5a-77af-8681-56c9cdeffa8e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9b6d-768b-b39c-ed4e48d7d6a6" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_019d496d-2f5a-77af-8681-56c9cdeffa8e" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForCommissions_019d496d-aba7-7a9f-b9fc-a47d2689fb7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentsForCommissions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9b6d-768b-b39c-ed4e48d7d6a6" xlink:to="loc_us-gaap_PaymentsForCommissions_019d496d-aba7-7a9f-b9fc-a47d2689fb7f" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/BasisofFinancialStatementsScheduleofChangesinOtherComprehensiveEarningsDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#BasisofFinancialStatementsScheduleofChangesinOtherComprehensiveEarningsDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/BasisofFinancialStatementsScheduleofChangesinOtherComprehensiveEarningsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019cb454-9b6d-7ee6-8e97-f0a853a8b9af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019cb454-9b6d-75af-a122-8804b9a4172e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019cb454-9b6d-7ee6-8e97-f0a853a8b9af" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019cb454-9b6d-75af-a122-8804b9a4172e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_019cb454-9b6d-7c3b-a4f6-863821eb6cc7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_019cb454-9b6d-75af-a122-8804b9a4172e" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_019cb454-9b6d-7c3b-a4f6-863821eb6cc7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019cb454-9b6d-7c3b-a4f6-863821eb6cc7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019cb454-9b6d-7c3b-a4f6-863821eb6cc7" xlink:to="loc_us-gaap_EquityComponentDomain_019cb454-9b6d-7c3b-a4f6-863821eb6cc7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_019cb454-9b6d-7cea-8a0e-4ce8e1723191" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_019cb454-9b6d-7c3b-a4f6-863821eb6cc7" xlink:to="loc_us-gaap_EquityComponentDomain_019cb454-9b6d-7cea-8a0e-4ce8e1723191" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_019cb454-9b6d-7e53-a74a-f119061bd555" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cb454-9b6d-7cea-8a0e-4ce8e1723191" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_019cb454-9b6d-7e53-a74a-f119061bd555" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociLiabilityForFuturePolicyBenefitParentMember_019cb454-9b6d-756a-8648-c0587bef6510" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociLiabilityForFuturePolicyBenefitParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cb454-9b6d-7cea-8a0e-4ce8e1723191" xlink:to="loc_us-gaap_AociLiabilityForFuturePolicyBenefitParentMember_019cb454-9b6d-756a-8648-c0587bef6510" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskParentMember_019cb454-9b6d-7bd0-b7a8-5da341d7bd83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cb454-9b6d-7cea-8a0e-4ce8e1723191" xlink:to="loc_us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskParentMember_019cb454-9b6d-7bd0-b7a8-5da341d7bd83" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019cb454-9b6d-7a87-b75a-dcd3f902a8fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cb454-9b6d-7cea-8a0e-4ce8e1723191" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_019cb454-9b6d-7a87-b75a-dcd3f902a8fc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019cb454-9b6d-7994-885b-88b15fab4ea4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_019cb454-9b6d-7cea-8a0e-4ce8e1723191" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_019cb454-9b6d-7994-885b-88b15fab4ea4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019cb454-9b6d-77c1-9da5-f64df4676887" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_019cb454-9b6d-7ee6-8e97-f0a853a8b9af" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019cb454-9b6d-77c1-9da5-f64df4676887" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019cb454-9b6d-716a-b87f-445296438cf1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019cb454-9b6d-77c1-9da5-f64df4676887" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019cb454-9b6d-716a-b87f-445296438cf1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_019cb454-9b6d-7b65-b186-e054bf4813e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019cb454-9b6d-77c1-9da5-f64df4676887" xlink:to="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax_019cb454-9b6d-7b65-b186-e054bf4813e5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTax_019cb454-9b6d-7639-b831-ef329f38d9ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019cb454-9b6d-77c1-9da5-f64df4676887" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeTax_019cb454-9b6d-7639-b831-ef329f38d9ff" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTax_019cb454-9b6d-7ac8-b9c6-32ff1f0779e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019cb454-9b6d-77c1-9da5-f64df4676887" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTax_019cb454-9b6d-7ac8-b9c6-32ff1f0779e8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_019cb454-9b6d-707e-b089-c76819b4ca91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_019cb454-9b6d-7f03-8895-b0532cad22c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAociCurrentPeriodTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTaxAbstract_019cb454-9b6d-77c1-9da5-f64df4676887" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_019cb454-9b6d-7f03-8895-b0532cad22c7" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/FairValueofFinancialInstrumentsCarryingAmountsofAssetsandLiabilitiesatEstimatedFairValueMeasuredonaRecurringBasisDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#FairValueofFinancialInstrumentsCarryingAmountsofAssetsandLiabilitiesatEstimatedFairValueMeasuredonaRecurringBasisDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/FairValueofFinancialInstrumentsCarryingAmountsofAssetsandLiabilitiesatEstimatedFairValueMeasuredonaRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cb454-9b6d-72df-81a3-90259a35fe45" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cb454-9b6d-7a77-9d44-e155fab7c8ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cb454-9b6d-72df-81a3-90259a35fe45" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cb454-9b6d-7a77-9d44-e155fab7c8ea" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019cb454-9b6d-75ed-b9ae-63893b9c0a99" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cb454-9b6d-7a77-9d44-e155fab7c8ea" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019cb454-9b6d-75ed-b9ae-63893b9c0a99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-75ed-b9ae-63893b9c0a99_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cb454-9b6d-75ed-b9ae-63893b9c0a99" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-75ed-b9ae-63893b9c0a99_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-793e-9955-03e8ad6139e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cb454-9b6d-75ed-b9ae-63893b9c0a99" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-793e-9955-03e8ad6139e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019cb454-9b6d-718d-b18c-217aeb77de9d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-793e-9955-03e8ad6139e8" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019cb454-9b6d-718d-b18c-217aeb77de9d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019cb454-9b6d-7587-906a-87680bb0d314" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-793e-9955-03e8ad6139e8" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019cb454-9b6d-7587-906a-87680bb0d314" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019cb454-9b6d-7472-beb2-8fbe7f363404" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-793e-9955-03e8ad6139e8" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019cb454-9b6d-7472-beb2-8fbe7f363404" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_HybridsMember_019cb454-9b6d-7726-a0e3-6d337df6a92c" xlink:href="fg-20260331.xsd#fg_HybridsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-793e-9955-03e8ad6139e8" xlink:to="loc_fg_HybridsMember_019cb454-9b6d-7726-a0e3-6d337df6a92c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019cb454-9b6d-7323-851f-3f55d74f54c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-793e-9955-03e8ad6139e8" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019cb454-9b6d-7323-851f-3f55d74f54c6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019cb454-9b6d-75c5-98f8-cc206d01f638" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-793e-9955-03e8ad6139e8" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019cb454-9b6d-75c5-98f8-cc206d01f638" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_019cb454-9b6d-7b6d-bad1-b27d2846213f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-793e-9955-03e8ad6139e8" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_019cb454-9b6d-7b6d-bad1-b27d2846213f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019cb454-9b6d-7020-a9dc-440ecc809399" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-793e-9955-03e8ad6139e8" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019cb454-9b6d-7020-a9dc-440ecc809399" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_019cb454-9b6d-70e5-b08d-2b4ee60ab101" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-793e-9955-03e8ad6139e8" xlink:to="loc_us-gaap_PreferredStockMember_019cb454-9b6d-70e5-b08d-2b4ee60ab101" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019cb454-9b6d-7d1b-bfa3-359badd13155" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-793e-9955-03e8ad6139e8" xlink:to="loc_us-gaap_CommonStockMember_019cb454-9b6d-7d1b-bfa3-359badd13155" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_UnconsolidatedInvestmentsMember_019cb454-9b6d-7291-9177-b56cba4754cf" xlink:href="fg-20260331.xsd#fg_UnconsolidatedInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-793e-9955-03e8ad6139e8" xlink:to="loc_fg_UnconsolidatedInvestmentsMember_019cb454-9b6d-7291-9177-b56cba4754cf" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermInvestmentsMember_019cb454-9b6d-74ea-88ce-38f578e9797f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLongTermInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-793e-9955-03e8ad6139e8" xlink:to="loc_us-gaap_OtherLongTermInvestmentsMember_019cb454-9b6d-74ea-88ce-38f578e9797f" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9b6d-7380-b496-dd71bc36b0fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cb454-9b6d-7a77-9d44-e155fab7c8ea" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9b6d-7380-b496-dd71bc36b0fe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9b6d-7380-b496-dd71bc36b0fe_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9b6d-7380-b496-dd71bc36b0fe" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9b6d-7380-b496-dd71bc36b0fe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9b6d-7698-b224-2cd8739b0f46" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9b6d-7380-b496-dd71bc36b0fe" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9b6d-7698-b224-2cd8739b0f46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember_019cb454-9b6d-742a-8754-23ef23be0e26" xlink:href="fg-20260331.xsd#fg_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9b6d-7698-b224-2cd8739b0f46" xlink:to="loc_fg_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember_019cb454-9b6d-742a-8754-23ef23be0e26" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019cb454-9b6d-7d90-8f5a-a9b6deb64079" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9b6d-7698-b224-2cd8739b0f46" xlink:to="loc_us-gaap_InterestRateSwapMember_019cb454-9b6d-7d90-8f5a-a9b6deb64079" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_EmbeddedDerivativesInReinsuranceContractsMember_019cb454-9b6d-76ae-90c4-567fe7e140a8" xlink:href="fg-20260331.xsd#fg_EmbeddedDerivativesInReinsuranceContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9b6d-7698-b224-2cd8739b0f46" xlink:to="loc_fg_EmbeddedDerivativesInReinsuranceContractsMember_019cb454-9b6d-76ae-90c4-567fe7e140a8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cb454-9b6d-79b8-b933-363900e5ff9e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cb454-9b6d-7a77-9d44-e155fab7c8ea" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cb454-9b6d-79b8-b933-363900e5ff9e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb454-9b6d-79b8-b933-363900e5ff9e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cb454-9b6d-79b8-b933-363900e5ff9e" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb454-9b6d-79b8-b933-363900e5ff9e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb454-9b6d-7775-b59d-6d603c70f463" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cb454-9b6d-79b8-b933-363900e5ff9e" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb454-9b6d-7775-b59d-6d603c70f463" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019cb454-9b6d-738c-891e-d9a98319e183" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb454-9b6d-7775-b59d-6d603c70f463" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019cb454-9b6d-738c-891e-d9a98319e183" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019cb454-9b6d-7941-8e58-d1dfe1d0b535" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb454-9b6d-7775-b59d-6d603c70f463" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019cb454-9b6d-7941-8e58-d1dfe1d0b535" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019cb454-9b6d-7f92-9c2a-713f40e551a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb454-9b6d-7775-b59d-6d603c70f463" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019cb454-9b6d-7f92-9c2a-713f40e551a1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019cb454-9b6d-7ccd-ba87-8de681bd5e37" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb454-9b6d-7775-b59d-6d603c70f463" xlink:to="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019cb454-9b6d-7ccd-ba87-8de681bd5e37" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019cb454-9b6d-73d0-992a-5c274b999ac5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cb454-9b6d-7a77-9d44-e155fab7c8ea" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019cb454-9b6d-73d0-992a-5c274b999ac5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cb454-9b6d-73d0-992a-5c274b999ac5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019cb454-9b6d-73d0-992a-5c274b999ac5" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cb454-9b6d-73d0-992a-5c274b999ac5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019cb454-9b6d-7e38-821c-8f9b3fb83f93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019cb454-9b6d-73d0-992a-5c274b999ac5" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019cb454-9b6d-7e38-821c-8f9b3fb83f93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cb454-9b6d-7e47-a714-a2784f6df3d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019cb454-9b6d-7e38-821c-8f9b3fb83f93" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cb454-9b6d-7e47-a714-a2784f6df3d3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019cb454-9b6d-7d45-932c-3e4d77915284" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cb454-9b6d-7e47-a714-a2784f6df3d3" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019cb454-9b6d-7d45-932c-3e4d77915284" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019cb454-9b6d-79e8-ae45-6c439a58c30f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cb454-9b6d-72df-81a3-90259a35fe45" xlink:to="loc_us-gaap_AssetsAbstract_019cb454-9b6d-79e8-ae45-6c439a58c30f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019cb454-9b6d-712e-9d25-54f2932321ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9b6d-79e8-ae45-6c439a58c30f" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_019cb454-9b6d-712e-9d25-54f2932321ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019cb454-9b6d-707b-83bf-cb800b48614d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9b6d-79e8-ae45-6c439a58c30f" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019cb454-9b6d-707b-83bf-cb800b48614d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HeldToMaturitySecuritiesFairValue_019dce99-c3fb-78f6-8d60-a977831d8007" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HeldToMaturitySecuritiesFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9b6d-79e8-ae45-6c439a58c30f" xlink:to="loc_us-gaap_HeldToMaturitySecuritiesFairValue_019dce99-c3fb-78f6-8d60-a977831d8007" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNi_019cb454-9b6d-731b-a96f-3f735ab486b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNi"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9b6d-79e8-ae45-6c439a58c30f" xlink:to="loc_us-gaap_EquitySecuritiesFvNi_019cb454-9b6d-731b-a96f-3f735ab486b6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_019cb454-9b6d-7f39-9675-c7f185d794c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9b6d-79e8-ae45-6c439a58c30f" xlink:to="loc_us-gaap_DerivativeAssets_019cb454-9b6d-7f39-9675-c7f185d794c5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentsFairValueDisclosure_019cb454-9b6d-7aed-b439-a6b409cc8a64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9b6d-79e8-ae45-6c439a58c30f" xlink:to="loc_us-gaap_EquityMethodInvestmentsFairValueDisclosure_019cb454-9b6d-7aed-b439-a6b409cc8a64" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsFairValueDisclosure_019cb454-9b6d-7f28-a86d-0559c8621a2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9b6d-79e8-ae45-6c439a58c30f" xlink:to="loc_us-gaap_OtherAssetsFairValueDisclosure_019cb454-9b6d-7f28-a86d-0559c8621a2a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_OtherLoansWithinOtherLongTermInvestmentsFairValue_019d8757-b1ac-731b-b7aa-2cc029c513f6" xlink:href="fg-20260331.xsd#fg_OtherLoansWithinOtherLongTermInvestmentsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9b6d-79e8-ae45-6c439a58c30f" xlink:to="loc_fg_OtherLoansWithinOtherLongTermInvestmentsFairValue_019d8757-b1ac-731b-b7aa-2cc029c513f6" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ShortTermInvestmentsFairValue_019cb454-9b6d-799a-ab93-0341874e0aad" xlink:href="fg-20260331.xsd#fg_ShortTermInvestmentsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9b6d-79e8-ae45-6c439a58c30f" xlink:to="loc_fg_ShortTermInvestmentsFairValue_019cb454-9b6d-799a-ab93-0341874e0aad" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_IndexedAnnuitiesIULCededEmbeddedDerivativesIncludedInReinsuranceRecoverable_019d47c8-16ff-7b1d-b9cb-a2eec031a9be" xlink:href="fg-20260331.xsd#fg_IndexedAnnuitiesIULCededEmbeddedDerivativesIncludedInReinsuranceRecoverable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9b6d-79e8-ae45-6c439a58c30f" xlink:to="loc_fg_IndexedAnnuitiesIULCededEmbeddedDerivativesIncludedInReinsuranceRecoverable_019d47c8-16ff-7b1d-b9cb-a2eec031a9be" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableFairValueDisclosure_019cb454-9b6d-7122-8ea7-cb1af6efcc48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NotesReceivableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9b6d-79e8-ae45-6c439a58c30f" xlink:to="loc_us-gaap_NotesReceivableFairValueDisclosure_019cb454-9b6d-7122-8ea7-cb1af6efcc48" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAssetAmount_019cb454-9b6d-7d23-9902-9578710b3913" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitAssetAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9b6d-79e8-ae45-6c439a58c30f" xlink:to="loc_us-gaap_MarketRiskBenefitAssetAmount_019cb454-9b6d-7d23-9902-9578710b3913" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019cb454-9b6d-7169-9da3-66dfaf143c9d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9b6d-79e8-ae45-6c439a58c30f" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019cb454-9b6d-7169-9da3-66dfaf143c9d" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_019cb454-9b6d-7eaa-b24c-56eebdec1dda" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cb454-9b6d-72df-81a3-90259a35fe45" xlink:to="loc_us-gaap_LiabilitiesAbstract_019cb454-9b6d-7eaa-b24c-56eebdec1dda" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetsAbstract_019cb454-9b6d-766e-b535-e9e5ef610b66" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019cb454-9b6d-7eaa-b24c-56eebdec1dda" xlink:to="loc_us-gaap_DerivativeAssetsAbstract_019cb454-9b6d-766e-b535-e9e5ef610b66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_019cb454-9b6d-7758-89bd-daedfd84382d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_019cb454-9b6d-766e-b535-e9e5ef610b66" xlink:to="loc_us-gaap_DerivativeLiabilities_019cb454-9b6d-7758-89bd-daedfd84382d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_EmbeddedDerivativeLiabilityNet_019cb454-9b6d-765b-8cf8-39621809713a" xlink:href="fg-20260331.xsd#fg_EmbeddedDerivativeLiabilityNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeAssetsAbstract_019cb454-9b6d-766e-b535-e9e5ef610b66" xlink:to="loc_fg_EmbeddedDerivativeLiabilityNet_019cb454-9b6d-765b-8cf8-39621809713a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019cb454-9b6d-70db-a3b5-fbd02c43fc75" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019cb454-9b6d-7eaa-b24c-56eebdec1dda" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019cb454-9b6d-70db-a3b5-fbd02c43fc75" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitLiabilityAmount_019cb454-9b6d-7cb9-a24c-cdafeb41ea88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitLiabilityAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019cb454-9b6d-7eaa-b24c-56eebdec1dda" xlink:to="loc_us-gaap_MarketRiskBenefitLiabilityAmount_019cb454-9b6d-7cb9-a24c-cdafeb41ea88" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancialLiabilitiesNetFairValueDisclosure_019df9da-6ea6-7334-bdc6-c47c6f71e67d" xlink:href="fg-20260331.xsd#fg_FinancialLiabilitiesNetFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019cb454-9b6d-7eaa-b24c-56eebdec1dda" xlink:to="loc_fg_FinancialLiabilitiesNetFairValueDisclosure_019df9da-6ea6-7334-bdc6-c47c6f71e67d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialLiabilitiesFairValueDisclosure_019d47ca-1533-7c5a-903f-7d6a455642d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialLiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019cb454-9b6d-7eaa-b24c-56eebdec1dda" xlink:to="loc_us-gaap_FinancialLiabilitiesFairValueDisclosure_019d47ca-1533-7c5a-903f-7d6a455642d5" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/FairValueofFinancialInstrumentsNarrativeDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#FairValueofFinancialInstrumentsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/FairValueofFinancialInstrumentsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cb454-9b6d-78e1-b254-433f4606b748" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cb454-9b6d-70c4-83dd-5338863f0a74" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cb454-9b6d-78e1-b254-433f4606b748" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cb454-9b6d-70c4-83dd-5338863f0a74" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019cb454-9b6d-7c89-9bc5-0bf2776c5e91" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cb454-9b6d-70c4-83dd-5338863f0a74" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019cb454-9b6d-7c89-9bc5-0bf2776c5e91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-7c89-9bc5-0bf2776c5e91_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cb454-9b6d-7c89-9bc5-0bf2776c5e91" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-7c89-9bc5-0bf2776c5e91_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-73d1-86a9-d1d5a5336b4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cb454-9b6d-7c89-9bc5-0bf2776c5e91" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-73d1-86a9-d1d5a5336b4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_CreditLinkedNoteMember_019cb454-9b6d-7521-a947-1f9959caf17c" xlink:href="fg-20260331.xsd#fg_CreditLinkedNoteMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-73d1-86a9-d1d5a5336b4e" xlink:to="loc_fg_CreditLinkedNoteMember_019cb454-9b6d-7521-a947-1f9959caf17c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_019cb454-9b6d-7106-b3c2-07d9aa2c85ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cb454-9b6d-70c4-83dd-5338863f0a74" xlink:to="loc_us-gaap_ValuationTechniqueAxis_019cb454-9b6d-7106-b3c2-07d9aa2c85ec" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_019cb454-9b6d-7106-b3c2-07d9aa2c85ec_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_019cb454-9b6d-7106-b3c2-07d9aa2c85ec" xlink:to="loc_us-gaap_ValuationTechniqueDomain_019cb454-9b6d-7106-b3c2-07d9aa2c85ec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_019cb454-9b6d-78ab-85c5-adc5959064c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_019cb454-9b6d-7106-b3c2-07d9aa2c85ec" xlink:to="loc_us-gaap_ValuationTechniqueDomain_019cb454-9b6d-78ab-85c5-adc5959064c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeApproachValuationTechniqueMember_019cb454-9b6d-7c03-a4dc-61d8eec90944" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeApproachValuationTechniqueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019cb454-9b6d-78ab-85c5-adc5959064c7" xlink:to="loc_us-gaap_IncomeApproachValuationTechniqueMember_019cb454-9b6d-7c03-a4dc-61d8eec90944" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativePriceRiskOptionStrikePrice_019cb454-9b6d-7da0-9496-f1ef6d3ee124" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativePriceRiskOptionStrikePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cb454-9b6d-78e1-b254-433f4606b748" xlink:to="loc_us-gaap_DerivativePriceRiskOptionStrikePrice_019cb454-9b6d-7da0-9496-f1ef6d3ee124" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/FairValueofFinancialInstrumentsQuantitativeInformationRegardingSignificantUnobservableInputsUsedforRecurringLevel3FairValueMeasurementsofFinancialInstrumentsDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#FairValueofFinancialInstrumentsQuantitativeInformationRegardingSignificantUnobservableInputsUsedforRecurringLevel3FairValueMeasurementsofFinancialInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/FairValueofFinancialInstrumentsQuantitativeInformationRegardingSignificantUnobservableInputsUsedforRecurringLevel3FairValueMeasurementsofFinancialInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019cb454-9b6d-78ac-aca4-619425fb3fcf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019cb454-9b6d-75d9-b0d0-8cf8dfeda450" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019cb454-9b6d-78ac-aca4-619425fb3fcf" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019cb454-9b6d-75d9-b0d0-8cf8dfeda450" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019cb454-9b6d-7405-9e2c-a4838432cc73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019cb454-9b6d-75d9-b0d0-8cf8dfeda450" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019cb454-9b6d-7405-9e2c-a4838432cc73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-7405-9e2c-a4838432cc73_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cb454-9b6d-7405-9e2c-a4838432cc73" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-7405-9e2c-a4838432cc73_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-764a-9b17-d552fdca5bf7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cb454-9b6d-7405-9e2c-a4838432cc73" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-764a-9b17-d552fdca5bf7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019cb454-9b6d-706b-8d37-0b359773bf58" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-764a-9b17-d552fdca5bf7" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019cb454-9b6d-706b-8d37-0b359773bf58" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019cb454-9b6d-791f-a988-0a2cf732eb54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-764a-9b17-d552fdca5bf7" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019cb454-9b6d-791f-a988-0a2cf732eb54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019cb454-9b6d-7a76-acf7-d68d860875f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-764a-9b17-d552fdca5bf7" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019cb454-9b6d-7a76-acf7-d68d860875f2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019cb454-9b6d-7957-b6da-0fa813404294" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-764a-9b17-d552fdca5bf7" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019cb454-9b6d-7957-b6da-0fa813404294" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019cb454-9b6d-748e-85a4-37830db2c1c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-764a-9b17-d552fdca5bf7" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019cb454-9b6d-748e-85a4-37830db2c1c3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentsMember_019cb454-9b6d-77c6-a9d5-090cdb824158" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-764a-9b17-d552fdca5bf7" xlink:to="loc_us-gaap_EquityMethodInvestmentsMember_019cb454-9b6d-77c6-a9d5-090cdb824158" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_EmbeddedDerivativeOtherLongTermInvestmentsAvailableForSaleMember_019cb454-9b6d-78d0-98af-fbcdd7c09c4f" xlink:href="fg-20260331.xsd#fg_EmbeddedDerivativeOtherLongTermInvestmentsAvailableForSaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-764a-9b17-d552fdca5bf7" xlink:to="loc_fg_EmbeddedDerivativeOtherLongTermInvestmentsAvailableForSaleMember_019cb454-9b6d-78d0-98af-fbcdd7c09c4f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_IndexedAnnuitiesIULCededEmbeddedDerivativesMember_019d47d7-5081-784f-a26b-88b6f3a86c47" xlink:href="fg-20260331.xsd#fg_IndexedAnnuitiesIULCededEmbeddedDerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-764a-9b17-d552fdca5bf7" xlink:to="loc_fg_IndexedAnnuitiesIULCededEmbeddedDerivativesMember_019d47d7-5081-784f-a26b-88b6f3a86c47" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_LoanReceivableCommitmentAdvancesMember_019cb454-9b6d-7da6-8b1d-692a5ea8cd4f" xlink:href="fg-20260331.xsd#fg_LoanReceivableCommitmentAdvancesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-764a-9b17-d552fdca5bf7" xlink:to="loc_fg_LoanReceivableCommitmentAdvancesMember_019cb454-9b6d-7da6-8b1d-692a5ea8cd4f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MarketRiskBenefitAssetMember_019cb454-9b6d-76f6-8b2e-4816d5775941" xlink:href="fg-20260331.xsd#fg_MarketRiskBenefitAssetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-764a-9b17-d552fdca5bf7" xlink:to="loc_fg_MarketRiskBenefitAssetMember_019cb454-9b6d-76f6-8b2e-4816d5775941" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MarketRiskBenefitLiabilityMember_019cb454-9b6d-7259-a329-f745f16b895e" xlink:href="fg-20260331.xsd#fg_MarketRiskBenefitLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-764a-9b17-d552fdca5bf7" xlink:to="loc_fg_MarketRiskBenefitLiabilityMember_019cb454-9b6d-7259-a329-f745f16b895e" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9b6d-76fa-823d-e68281f9e765" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019cb454-9b6d-75d9-b0d0-8cf8dfeda450" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9b6d-76fa-823d-e68281f9e765" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9b6d-76fa-823d-e68281f9e765_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9b6d-76fa-823d-e68281f9e765" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9b6d-76fa-823d-e68281f9e765_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9b6d-7034-89f1-ac29c4db37bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9b6d-76fa-823d-e68281f9e765" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9b6d-7034-89f1-ac29c4db37bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember_019cb454-9b6d-772f-8580-e22927f810f9" xlink:href="fg-20260331.xsd#fg_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9b6d-7034-89f1-ac29c4db37bc" xlink:to="loc_fg_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember_019cb454-9b6d-772f-8580-e22927f810f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ContingentConsiderationMember_019cb454-9b6d-76d3-92cf-b93020709565" xlink:href="fg-20260331.xsd#fg_ContingentConsiderationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9b6d-7034-89f1-ac29c4db37bc" xlink:to="loc_fg_ContingentConsiderationMember_019cb454-9b6d-76d3-92cf-b93020709565" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019cb454-9b6d-7023-84cd-267e95422335" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019cb454-9b6d-75d9-b0d0-8cf8dfeda450" xlink:to="loc_srt_RangeAxis_019cb454-9b6d-7023-84cd-267e95422335" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cb454-9b6d-7023-84cd-267e95422335_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019cb454-9b6d-7023-84cd-267e95422335" xlink:to="loc_srt_RangeMember_019cb454-9b6d-7023-84cd-267e95422335_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cb454-9b6d-7d89-8e5c-75746d542dca" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019cb454-9b6d-7023-84cd-267e95422335" xlink:to="loc_srt_RangeMember_019cb454-9b6d-7d89-8e5c-75746d542dca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019cb454-9b6d-71ad-b5f3-f2f7c8913f89" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019cb454-9b6d-7d89-8e5c-75746d542dca" xlink:to="loc_srt_MinimumMember_019cb454-9b6d-71ad-b5f3-f2f7c8913f89" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019cb454-9b6d-7ed2-b931-c23cc9b3c0de" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019cb454-9b6d-7d89-8e5c-75746d542dca" xlink:to="loc_srt_MaximumMember_019cb454-9b6d-7ed2-b931-c23cc9b3c0de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_WeightedAverageMember_019cb454-9b6d-796c-829e-9532fb6c89cd" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_WeightedAverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019cb454-9b6d-7d89-8e5c-75746d542dca" xlink:to="loc_srt_WeightedAverageMember_019cb454-9b6d-796c-829e-9532fb6c89cd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_019cb454-9b6d-72f1-bdc8-1bd79269cac1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019cb454-9b6d-75d9-b0d0-8cf8dfeda450" xlink:to="loc_us-gaap_ValuationTechniqueAxis_019cb454-9b6d-72f1-bdc8-1bd79269cac1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_019cb454-9b6d-72f1-bdc8-1bd79269cac1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_019cb454-9b6d-72f1-bdc8-1bd79269cac1" xlink:to="loc_us-gaap_ValuationTechniqueDomain_019cb454-9b6d-72f1-bdc8-1bd79269cac1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_019cb454-9b6d-7605-99f8-5dcecffa0503" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_019cb454-9b6d-72f1-bdc8-1bd79269cac1" xlink:to="loc_us-gaap_ValuationTechniqueDomain_019cb454-9b6d-7605-99f8-5dcecffa0503" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ThirdPartyValuationTechniqueMember_019cb454-9b6d-7cf6-948f-350c74f99096" xlink:href="fg-20260331.xsd#fg_ThirdPartyValuationTechniqueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019cb454-9b6d-7605-99f8-5dcecffa0503" xlink:to="loc_fg_ThirdPartyValuationTechniqueMember_019cb454-9b6d-7cf6-948f-350c74f99096" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketApproachValuationTechniqueMember_019cb454-9b6d-73a6-88c1-6d61fbb8ccb8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketApproachValuationTechniqueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019cb454-9b6d-7605-99f8-5dcecffa0503" xlink:to="loc_us-gaap_MarketApproachValuationTechniqueMember_019cb454-9b6d-73a6-88c1-6d61fbb8ccb8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_BlackScholesModelMember_019cb454-9b6d-762f-8345-cd54d5dd4326" xlink:href="fg-20260331.xsd#fg_BlackScholesModelMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019cb454-9b6d-7605-99f8-5dcecffa0503" xlink:to="loc_fg_BlackScholesModelMember_019cb454-9b6d-762f-8345-cd54d5dd4326" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_019cb454-9b6d-7880-9fed-01979b6fe27f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueDiscountedCashFlowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_019cb454-9b6d-7605-99f8-5dcecffa0503" xlink:to="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_019cb454-9b6d-7880-9fed-01979b6fe27f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_019cb454-9b6d-779a-b117-c7386d434d99" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019cb454-9b6d-75d9-b0d0-8cf8dfeda450" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_019cb454-9b6d-779a-b117-c7386d434d99" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019cb454-9b6d-779a-b117-c7386d434d99_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_019cb454-9b6d-779a-b117-c7386d434d99" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019cb454-9b6d-779a-b117-c7386d434d99_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_019cb454-9b6d-7135-8d88-0a8bdee3ed0e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_019cb454-9b6d-779a-b117-c7386d434d99" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_019cb454-9b6d-7135-8d88-0a8bdee3ed0e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputDiscountRateMember_019cb454-9b6d-7d37-b6a5-2b694b1b0526" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cb454-9b6d-7135-8d88-0a8bdee3ed0e" xlink:to="loc_us-gaap_MeasurementInputDiscountRateMember_019cb454-9b6d-7d37-b6a5-2b694b1b0526" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputEbitdaMultipleMember_019cb454-9b6d-7796-877e-0b1891d6f02f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputEbitdaMultipleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cb454-9b6d-7135-8d88-0a8bdee3ed0e" xlink:to="loc_us-gaap_MeasurementInputEbitdaMultipleMember_019cb454-9b6d-7796-877e-0b1891d6f02f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MeasurementInputTypeMarketValueOfFundMember_019cb454-9b6d-7eb7-820a-0fdf0c941182" xlink:href="fg-20260331.xsd#fg_MeasurementInputTypeMarketValueOfFundMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cb454-9b6d-7135-8d88-0a8bdee3ed0e" xlink:to="loc_fg_MeasurementInputTypeMarketValueOfFundMember_019cb454-9b6d-7eb7-820a-0fdf0c941182" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MeasurementInputMarketValueOfOptionMember_019cb454-9b6d-7ec6-9a09-9aece528ba96" xlink:href="fg-20260331.xsd#fg_MeasurementInputMarketValueOfOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cb454-9b6d-7135-8d88-0a8bdee3ed0e" xlink:to="loc_fg_MeasurementInputMarketValueOfOptionMember_019cb454-9b6d-7ec6-9a09-9aece528ba96" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MeasurementInputMortalityMultiplierMember_019cb454-9b6d-7827-baaf-0d677615ae3c" xlink:href="fg-20260331.xsd#fg_MeasurementInputMortalityMultiplierMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cb454-9b6d-7135-8d88-0a8bdee3ed0e" xlink:to="loc_fg_MeasurementInputMortalityMultiplierMember_019cb454-9b6d-7827-baaf-0d677615ae3c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MeasurementInputSurrenderRatesMember_019cb454-9b6d-7682-b29b-89b1f25b8696" xlink:href="fg-20260331.xsd#fg_MeasurementInputSurrenderRatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cb454-9b6d-7135-8d88-0a8bdee3ed0e" xlink:to="loc_fg_MeasurementInputSurrenderRatesMember_019cb454-9b6d-7682-b29b-89b1f25b8696" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MeasurementInputPartialWithdrawalsRateMember_019cb454-9b6d-755f-9e3d-b3e9ce1e2678" xlink:href="fg-20260331.xsd#fg_MeasurementInputPartialWithdrawalsRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cb454-9b6d-7135-8d88-0a8bdee3ed0e" xlink:to="loc_fg_MeasurementInputPartialWithdrawalsRateMember_019cb454-9b6d-755f-9e3d-b3e9ce1e2678" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MeasurementInputNonPerformanceSpreadMember_019cb454-9b6d-7fe7-8e92-d0ec5769c9db" xlink:href="fg-20260331.xsd#fg_MeasurementInputNonPerformanceSpreadMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cb454-9b6d-7135-8d88-0a8bdee3ed0e" xlink:to="loc_fg_MeasurementInputNonPerformanceSpreadMember_019cb454-9b6d-7fe7-8e92-d0ec5769c9db" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MeasurementInputOptionCostMember_019cb454-9b6d-7554-ba3f-4be5d247029c" xlink:href="fg-20260331.xsd#fg_MeasurementInputOptionCostMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cb454-9b6d-7135-8d88-0a8bdee3ed0e" xlink:to="loc_fg_MeasurementInputOptionCostMember_019cb454-9b6d-7554-ba3f-4be5d247029c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MeasurementInputRiskAdjustedDiscountRateMember_019cb454-9b6d-728b-8c05-867291b2c926" xlink:href="fg-20260331.xsd#fg_MeasurementInputRiskAdjustedDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cb454-9b6d-7135-8d88-0a8bdee3ed0e" xlink:to="loc_fg_MeasurementInputRiskAdjustedDiscountRateMember_019cb454-9b6d-728b-8c05-867291b2c926" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MeasurementInputCollateralVolatilityMember_019cb454-9b6d-74ed-87a0-a8f87c67b747" xlink:href="fg-20260331.xsd#fg_MeasurementInputCollateralVolatilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cb454-9b6d-7135-8d88-0a8bdee3ed0e" xlink:to="loc_fg_MeasurementInputCollateralVolatilityMember_019cb454-9b6d-74ed-87a0-a8f87c67b747" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputMortalityRateMember_019cb454-9b6d-7a76-aaec-b0094565fcd5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputMortalityRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cb454-9b6d-7135-8d88-0a8bdee3ed0e" xlink:to="loc_us-gaap_MeasurementInputMortalityRateMember_019cb454-9b6d-7a76-aaec-b0094565fcd5" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MeasurementInputGMWBUtilizationMember_019cb454-9b6d-784f-b0aa-1d83c0455802" xlink:href="fg-20260331.xsd#fg_MeasurementInputGMWBUtilizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cb454-9b6d-7135-8d88-0a8bdee3ed0e" xlink:to="loc_fg_MeasurementInputGMWBUtilizationMember_019cb454-9b6d-784f-b0aa-1d83c0455802" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MeasurementInputEBITAVolatilityMember_019cb454-9b6d-7866-8378-51bd3ce8e033" xlink:href="fg-20260331.xsd#fg_MeasurementInputEBITAVolatilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cb454-9b6d-7135-8d88-0a8bdee3ed0e" xlink:to="loc_fg_MeasurementInputEBITAVolatilityMember_019cb454-9b6d-7866-8378-51bd3ce8e033" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MeasurementInputCounterpartyDiscountRateMember_019cb454-9b6d-74db-8ff8-7132d1163e5f" xlink:href="fg-20260331.xsd#fg_MeasurementInputCounterpartyDiscountRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cb454-9b6d-7135-8d88-0a8bdee3ed0e" xlink:to="loc_fg_MeasurementInputCounterpartyDiscountRateMember_019cb454-9b6d-74db-8ff8-7132d1163e5f" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MeasurementInputQuotedPriceMember_019cb454-9b6d-76fe-8ea5-c7f9f14edc70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MeasurementInputQuotedPriceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_019cb454-9b6d-7135-8d88-0a8bdee3ed0e" xlink:to="loc_us-gaap_MeasurementInputQuotedPriceMember_019cb454-9b6d-76fe-8ea5-c7f9f14edc70" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_019cb454-9b6d-764c-8802-169026a9870f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019cb454-9b6d-78ac-aca4-619425fb3fcf" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_019cb454-9b6d-764c-8802-169026a9870f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_019cb454-9b6d-7b8b-954f-63e36a653ae1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019cb454-9b6d-78ac-aca4-619425fb3fcf" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_019cb454-9b6d-7b8b-954f-63e36a653ae1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleMeasurementInput_019cb454-9b6d-7972-9470-4b886e830a97" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019cb454-9b6d-78ac-aca4-619425fb3fcf" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleMeasurementInput_019cb454-9b6d-7972-9470-4b886e830a97" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_EquityMethodInvestmentMeasurementInput_019cb454-9b6d-74d4-b1ae-d726160b4d29" xlink:href="fg-20260331.xsd#fg_EquityMethodInvestmentMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019cb454-9b6d-78ac-aca4-619425fb3fcf" xlink:to="loc_fg_EquityMethodInvestmentMeasurementInput_019cb454-9b6d-74d4-b1ae-d726160b4d29" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeAssetMeasurementInput_019cb454-9b6d-7f27-9c95-510c9381e3f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmbeddedDerivativeAssetMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019cb454-9b6d-78ac-aca4-619425fb3fcf" xlink:to="loc_us-gaap_EmbeddedDerivativeAssetMeasurementInput_019cb454-9b6d-7f27-9c95-510c9381e3f0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_LoanReceivableMeasurementInput_019cb454-9b6d-7917-9f6c-0d184157c0d2" xlink:href="fg-20260331.xsd#fg_LoanReceivableMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019cb454-9b6d-78ac-aca4-619425fb3fcf" xlink:to="loc_fg_LoanReceivableMeasurementInput_019cb454-9b6d-7917-9f6c-0d184157c0d2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitMeasurementInput_019cb454-9b6d-7d8b-9ce3-e4a6830b5f24" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019cb454-9b6d-78ac-aca4-619425fb3fcf" xlink:to="loc_us-gaap_MarketRiskBenefitMeasurementInput_019cb454-9b6d-7d8b-9ce3-e4a6830b5f24" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeLiabilityMeasurementInput_019cb454-9b6d-7d9f-bfc1-9610f3c98094" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmbeddedDerivativeLiabilityMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019cb454-9b6d-78ac-aca4-619425fb3fcf" xlink:to="loc_us-gaap_EmbeddedDerivativeLiabilityMeasurementInput_019cb454-9b6d-7d9f-bfc1-9610f3c98094" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_019cb454-9b6d-721b-aa68-d5f1d1eaa432" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019cb454-9b6d-78ac-aca4-619425fb3fcf" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_019cb454-9b6d-721b-aa68-d5f1d1eaa432" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/FairValueofFinancialInstrumentsChangestoFairValueofFinancialInstrumentsLevel3Details" xlink:type="simple" xlink:href="fg-20260331.xsd#FairValueofFinancialInstrumentsChangestoFairValueofFinancialInstrumentsLevel3Details"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/FairValueofFinancialInstrumentsChangestoFairValueofFinancialInstrumentsLevel3Details" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019cb454-9c21-7dea-acff-5b9b686dcce6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019cb454-9b6d-7b72-a66b-8d72ff193832" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019cb454-9c21-7dea-acff-5b9b686dcce6" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019cb454-9b6d-7b72-a66b-8d72ff193832" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019cb454-9b6d-7af7-95b2-e930640ffe72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019cb454-9b6d-7b72-a66b-8d72ff193832" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019cb454-9b6d-7af7-95b2-e930640ffe72" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-7af7-95b2-e930640ffe72_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cb454-9b6d-7af7-95b2-e930640ffe72" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-7af7-95b2-e930640ffe72_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-71bf-a013-d32e59a7f994" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cb454-9b6d-7af7-95b2-e930640ffe72" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-71bf-a013-d32e59a7f994" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019cb454-9b6d-7e14-8947-5fc61b38f8af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-71bf-a013-d32e59a7f994" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019cb454-9b6d-7e14-8947-5fc61b38f8af" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019cb454-9b6d-7f72-afb5-c63cf0931a8c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-71bf-a013-d32e59a7f994" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019cb454-9b6d-7f72-afb5-c63cf0931a8c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_HybridsMember_019cb454-9b6d-7a28-94a1-8dcf4f826732" xlink:href="fg-20260331.xsd#fg_HybridsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-71bf-a013-d32e59a7f994" xlink:to="loc_fg_HybridsMember_019cb454-9b6d-7a28-94a1-8dcf4f826732" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019cb454-9b6d-78d7-9dbd-63cdf835de9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-71bf-a013-d32e59a7f994" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019cb454-9b6d-78d7-9dbd-63cdf835de9c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019cb454-9b6d-7e1c-8088-6fb027fd1875" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-71bf-a013-d32e59a7f994" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019cb454-9b6d-7e1c-8088-6fb027fd1875" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019cb454-9b6d-7ab6-a9ed-b5ce220b1ae8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-71bf-a013-d32e59a7f994" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019cb454-9b6d-7ab6-a9ed-b5ce220b1ae8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_019cb454-9b6d-755a-ba22-556f03aa4500" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-71bf-a013-d32e59a7f994" xlink:to="loc_us-gaap_PreferredStockMember_019cb454-9b6d-755a-ba22-556f03aa4500" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019cb454-9b6d-7ce4-8275-6c8485de6bb8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-71bf-a013-d32e59a7f994" xlink:to="loc_us-gaap_CommonStockMember_019cb454-9b6d-7ce4-8275-6c8485de6bb8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DerivativeInvestmentMember_019cb454-9b6d-73bc-9a79-ea7574b70881" xlink:href="fg-20260331.xsd#fg_DerivativeInvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-71bf-a013-d32e59a7f994" xlink:to="loc_fg_DerivativeInvestmentMember_019cb454-9b6d-73bc-9a79-ea7574b70881" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentsMember_019cb454-9c21-7416-b339-b60983bc4ebe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-71bf-a013-d32e59a7f994" xlink:to="loc_us-gaap_EquityMethodInvestmentsMember_019cb454-9c21-7416-b339-b60983bc4ebe" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_AvailableForSaleEmbeddedDerivativesMember_019cb454-9c21-782e-ae13-3452b3621074" xlink:href="fg-20260331.xsd#fg_AvailableForSaleEmbeddedDerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-71bf-a013-d32e59a7f994" xlink:to="loc_fg_AvailableForSaleEmbeddedDerivativesMember_019cb454-9c21-782e-ae13-3452b3621074" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestmentsMember_019cb454-9c21-74ce-8947-3b101d669062" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-71bf-a013-d32e59a7f994" xlink:to="loc_us-gaap_ShortTermInvestmentsMember_019cb454-9c21-74ce-8947-3b101d669062" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_IndexedAnnuitiesIULCededEmbeddedDerivativesMember_019d47f0-c7fc-7f30-9760-f5186cb50e11" xlink:href="fg-20260331.xsd#fg_IndexedAnnuitiesIULCededEmbeddedDerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-71bf-a013-d32e59a7f994" xlink:to="loc_fg_IndexedAnnuitiesIULCededEmbeddedDerivativesMember_019d47f0-c7fc-7f30-9760-f5186cb50e11" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_LoanReceivableCommitmentAdvancesMember_019cb454-9c21-789b-b88a-409c2337b9b2" xlink:href="fg-20260331.xsd#fg_LoanReceivableCommitmentAdvancesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-71bf-a013-d32e59a7f994" xlink:to="loc_fg_LoanReceivableCommitmentAdvancesMember_019cb454-9c21-789b-b88a-409c2337b9b2" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_TotalAssetsBeforeMarketRiskBenefitMember_019cb454-9c21-7a3e-9be3-8c91bae45ee6" xlink:href="fg-20260331.xsd#fg_TotalAssetsBeforeMarketRiskBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-71bf-a013-d32e59a7f994" xlink:to="loc_fg_TotalAssetsBeforeMarketRiskBenefitMember_019cb454-9c21-7a3e-9be3-8c91bae45ee6" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MarketRiskBenefitAssetMember_019cb454-9c21-7bf5-ad57-22ae115b4206" xlink:href="fg-20260331.xsd#fg_MarketRiskBenefitAssetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-71bf-a013-d32e59a7f994" xlink:to="loc_fg_MarketRiskBenefitAssetMember_019cb454-9c21-7bf5-ad57-22ae115b4206" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_TotalLiabilitiesBeforeMarketRiskBenefitMember_019cb454-9c21-7cc6-9ce9-cef3ca8411c9" xlink:href="fg-20260331.xsd#fg_TotalLiabilitiesBeforeMarketRiskBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-71bf-a013-d32e59a7f994" xlink:to="loc_fg_TotalLiabilitiesBeforeMarketRiskBenefitMember_019cb454-9c21-7cc6-9ce9-cef3ca8411c9" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MarketRiskBenefitLiabilityMember_019cb454-9c21-7513-bc3b-82c4db2bebf2" xlink:href="fg-20260331.xsd#fg_MarketRiskBenefitLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9b6d-71bf-a013-d32e59a7f994" xlink:to="loc_fg_MarketRiskBenefitLiabilityMember_019cb454-9c21-7513-bc3b-82c4db2bebf2" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_019cb454-9c21-731f-b3ef-4b82ded64ec9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019cb454-9b6d-7b72-a66b-8d72ff193832" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_019cb454-9c21-731f-b3ef-4b82ded64ec9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019cb454-9c21-731f-b3ef-4b82ded64ec9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019cb454-9c21-731f-b3ef-4b82ded64ec9" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019cb454-9c21-731f-b3ef-4b82ded64ec9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019cb454-9c21-7684-aae2-3d6e60e8f751" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_019cb454-9c21-731f-b3ef-4b82ded64ec9" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019cb454-9c21-7684-aae2-3d6e60e8f751" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember_019cb454-9c21-7927-be78-551dd4aa3e3f" xlink:href="fg-20260331.xsd#fg_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019cb454-9c21-7684-aae2-3d6e60e8f751" xlink:to="loc_fg_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember_019cb454-9c21-7927-be78-551dd4aa3e3f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrencySwapMember_019de525-bf64-7eb7-a8b7-ea256bda8ef0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CurrencySwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019cb454-9c21-7684-aae2-3d6e60e8f751" xlink:to="loc_us-gaap_CurrencySwapMember_019de525-bf64-7eb7-a8b7-ea256bda8ef0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019cb454-9c21-7f16-9872-151b304b2aa6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019cb454-9c21-7684-aae2-3d6e60e8f751" xlink:to="loc_us-gaap_InterestRateSwapMember_019cb454-9c21-7f16-9872-151b304b2aa6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ContingentConsiderationLiabilityMember_019cb454-9c21-7561-a59f-fe5cb46177e1" xlink:href="fg-20260331.xsd#fg_ContingentConsiderationLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_019cb454-9c21-7684-aae2-3d6e60e8f751" xlink:to="loc_fg_ContingentConsiderationLiabilityMember_019cb454-9c21-7561-a59f-fe5cb46177e1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cb454-9c21-7c10-a530-51b2b3914908" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_019cb454-9b6d-7b72-a66b-8d72ff193832" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cb454-9c21-7c10-a530-51b2b3914908" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb454-9c21-7c10-a530-51b2b3914908_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cb454-9c21-7c10-a530-51b2b3914908" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb454-9c21-7c10-a530-51b2b3914908_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb454-9c21-7f53-9057-23d6a6fc751a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cb454-9c21-7c10-a530-51b2b3914908" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb454-9c21-7f53-9057-23d6a6fc751a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019cb454-9c21-70b8-9472-042498ed06e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb454-9c21-7f53-9057-23d6a6fc751a" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019cb454-9c21-70b8-9472-042498ed06e2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019cb454-9c21-7a58-9e86-945ba5bd6713" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_019cb454-9c21-7dea-acff-5b9b686dcce6" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019cb454-9c21-7a58-9e86-945ba5bd6713" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019cb454-9c21-7088-abfd-7b69674b7c62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019cb454-9c21-7a58-9e86-945ba5bd6713" xlink:to="loc_us-gaap_AssetsAbstract_019cb454-9c21-7088-abfd-7b69674b7c62" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesAbstract_019cb454-9c21-7be6-93a7-b2f176e4ac1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9c21-7088-abfd-7b69674b7c62" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesAbstract_019cb454-9c21-7be6-93a7-b2f176e4ac1d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019cb454-9c21-78f5-bb0c-f94a3950f49d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_019cb454-9c21-7be6-93a7-b2f176e4ac1d" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019cb454-9c21-78f5-bb0c-f94a3950f49d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_019cb454-9c21-700b-9f3c-b1c72ac5b0bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_019cb454-9c21-7be6-93a7-b2f176e4ac1d" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1_019cb454-9c21-700b-9f3c-b1c72ac5b0bf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_019cb454-9c21-7436-932e-f3cb568d8139" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_019cb454-9c21-7be6-93a7-b2f176e4ac1d" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss_019cb454-9c21-7436-932e-f3cb568d8139" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_019cb454-9c21-7a3a-83fc-6acd2308f512" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_019cb454-9c21-7be6-93a7-b2f176e4ac1d" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases_019cb454-9c21-7a3a-83fc-6acd2308f512" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales_019cb454-9c21-76b1-ab63-89562830b120" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_019cb454-9c21-7be6-93a7-b2f176e4ac1d" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales_019cb454-9c21-76b1-ab63-89562830b120" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_019cb454-9c21-7a72-8109-e2142c8fe25a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_019cb454-9c21-7be6-93a7-b2f176e4ac1d" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements_019cb454-9c21-7a72-8109-e2142c8fe25a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet_019cb454-9c21-760b-b149-4f62bb333994" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesAbstract_019cb454-9c21-7be6-93a7-b2f176e4ac1d" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet_019cb454-9c21-760b-b149-4f62bb333994" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue_019cb454-9c21-756e-b0f0-b4435065ebbd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci_019cb454-9c21-72a0-82c7-a69a6e88c28b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019cb454-9c21-7a58-9e86-945ba5bd6713" xlink:to="loc_us-gaap_FairValueAssetRecurringBasisStillHeldUnrealizedGainLossOci_019cb454-9c21-72a0-82c7-a69a6e88c28b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_019cb454-9c21-7e61-856f-dbe8b7fdf512" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019cb454-9c21-7a58-9e86-945ba5bd6713" xlink:to="loc_us-gaap_LiabilitiesAbstract_019cb454-9c21-7e61-856f-dbe8b7fdf512" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019cb454-9c21-7574-84ac-f810ca277c9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019cb454-9c21-7e61-856f-dbe8b7fdf512" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019cb454-9c21-7574-84ac-f810ca277c9c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_019cb454-9c21-7789-8edc-5cc5e77dc83a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019cb454-9c21-7e61-856f-dbe8b7fdf512" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_019cb454-9c21-7789-8edc-5cc5e77dc83a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_019cb454-9c21-7bdb-add6-ebe3e4605195" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019cb454-9c21-7e61-856f-dbe8b7fdf512" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInOtherComprehensiveIncome_019cb454-9c21-7bdb-add6-ebe3e4605195" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_019cb454-9c21-7ae5-903f-75b210dd81ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019cb454-9c21-7e61-856f-dbe8b7fdf512" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_019cb454-9c21-7ae5-903f-75b210dd81ff" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales_019cb454-9c21-78c8-ad27-3fbd740c2817" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019cb454-9c21-7e61-856f-dbe8b7fdf512" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySales_019cb454-9c21-78c8-ad27-3fbd740c2817" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_019cb454-9c21-7b51-b1eb-264009571547" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019cb454-9c21-7e61-856f-dbe8b7fdf512" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_019cb454-9c21-7b51-b1eb-264009571547" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet_019cb454-9c21-7439-b645-5e149b1721d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019cb454-9c21-7e61-856f-dbe8b7fdf512" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityTransfersNet_019cb454-9c21-7439-b645-5e149b1721d1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_019cb454-9c21-7aba-a980-0412e95f2dae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilityRecurringBasisStillHeldUnrealizedGainLossOci_019cb454-9c21-76a6-8dd6-7e3d7c2b540d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueLiabilityRecurringBasisStillHeldUnrealizedGainLossOci"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019cb454-9c21-7a58-9e86-945ba5bd6713" xlink:to="loc_us-gaap_FairValueLiabilityRecurringBasisStillHeldUnrealizedGainLossOci_019cb454-9c21-76a6-8dd6-7e3d7c2b540d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList_019cb454-9c21-7d83-a222-02ac9332c891" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019cb454-9c21-7a58-9e86-945ba5bd6713" xlink:to="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationAssetGainLossStatementOfIncomeExtensibleList_019cb454-9c21-7d83-a222-02ac9332c891" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleList_019cb454-9c21-70d2-9911-2a2fa7d3dc3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_019cb454-9c21-7a58-9e86-945ba5bd6713" xlink:to="loc_us-gaap_FairValueRecurringBasisUnobservableInputReconciliationLiabilityGainLossStatementOfIncomeExtensibleList_019cb454-9c21-70d2-9911-2a2fa7d3dc3a" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/FairValueofFinancialInstrumentsFairValueOptionDisclosuresDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#FairValueofFinancialInstrumentsFairValueOptionDisclosuresDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/FairValueofFinancialInstrumentsFairValueOptionDisclosuresDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019d480c-c00a-716d-9f05-4b1be1430802" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019d480c-c00a-7012-a753-c9d83d695eb4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019d480c-c00a-716d-9f05-4b1be1430802" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019d480c-c00a-7012-a753-c9d83d695eb4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019d480c-c00a-7795-a27c-61e8232635fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_019d480c-c00a-7012-a753-c9d83d695eb4" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019d480c-c00a-7795-a27c-61e8232635fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019d480c-c00a-7795-a27c-61e8232635fb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019d480c-c00a-7795-a27c-61e8232635fb" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019d480c-c00a-7795-a27c-61e8232635fb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019d480c-c00a-7111-aa74-699771e283c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019d480c-c00a-7795-a27c-61e8232635fb" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019d480c-c00a-7111-aa74-699771e283c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FairValueOptionEquityMethodInvestmentsMember_019dffbb-7fd9-7d5d-ab32-76206e651670" xlink:href="fg-20260331.xsd#fg_FairValueOptionEquityMethodInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019d480c-c00a-7111-aa74-699771e283c1" xlink:to="loc_fg_FairValueOptionEquityMethodInvestmentsMember_019dffbb-7fd9-7d5d-ab32-76206e651670" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FairValueOptionOtherLoansMember_019dffbc-49e6-72c3-9c4f-20ac3c027937" xlink:href="fg-20260331.xsd#fg_FairValueOptionOtherLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019d480c-c00a-7111-aa74-699771e283c1" xlink:to="loc_fg_FairValueOptionOtherLoansMember_019dffbc-49e6-72c3-9c4f-20ac3c027937" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FairValueOptionFixedMaturitySecuritiesMember_019dffbd-56bc-7cb3-a4d3-61bab19dd8fa" xlink:href="fg-20260331.xsd#fg_FairValueOptionFixedMaturitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019d480c-c00a-7111-aa74-699771e283c1" xlink:to="loc_fg_FairValueOptionFixedMaturitySecuritiesMember_019dffbd-56bc-7cb3-a4d3-61bab19dd8fa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_OtherLoans_019d4819-3b2b-7e45-89bb-fff23c133888" xlink:href="fg-20260331.xsd#fg_OtherLoans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_019d480c-c00a-716d-9f05-4b1be1430802" xlink:to="loc_fg_OtherLoans_019d4819-3b2b-7e45-89bb-fff23c133888" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/FairValueofFinancialInstrumentsCarryingValueandEstimatedFairValueofFinancialInstrumentsDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#FairValueofFinancialInstrumentsCarryingValueandEstimatedFairValueofFinancialInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/FairValueofFinancialInstrumentsCarryingValueandEstimatedFairValueofFinancialInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cb454-9c21-75bb-963b-152c5951340a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cb454-9c21-736a-967c-b808ce4964fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cb454-9c21-75bb-963b-152c5951340a" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cb454-9c21-736a-967c-b808ce4964fe" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cb454-9c21-7601-bf12-80ebb164413c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cb454-9c21-736a-967c-b808ce4964fe" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cb454-9c21-7601-bf12-80ebb164413c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb454-9c21-7601-bf12-80ebb164413c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cb454-9c21-7601-bf12-80ebb164413c" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb454-9c21-7601-bf12-80ebb164413c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb454-9c21-784b-b85d-da29bb2c4138" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_019cb454-9c21-7601-bf12-80ebb164413c" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb454-9c21-784b-b85d-da29bb2c4138" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_019cb454-9c21-77ec-8521-dc92a66f3db3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb454-9c21-784b-b85d-da29bb2c4138" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_019cb454-9c21-77ec-8521-dc92a66f3db3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_019cb454-9c21-7213-8178-5ed0288248d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb454-9c21-784b-b85d-da29bb2c4138" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_019cb454-9c21-7213-8178-5ed0288248d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_019cb454-9c21-7536-ac02-ff97b08bf4ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb454-9c21-784b-b85d-da29bb2c4138" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_019cb454-9c21-7536-ac02-ff97b08bf4ed" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019cb454-9c21-76a1-814c-2be7a7411e1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_019cb454-9c21-784b-b85d-da29bb2c4138" xlink:to="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_019cb454-9c21-76a1-814c-2be7a7411e1c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019cb454-9c21-7fc0-8c9f-767a07000eff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_019cb454-9c21-736a-967c-b808ce4964fe" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019cb454-9c21-7fc0-8c9f-767a07000eff" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cb454-9c21-7fc0-8c9f-767a07000eff_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019cb454-9c21-7fc0-8c9f-767a07000eff" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cb454-9c21-7fc0-8c9f-767a07000eff_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019cb454-9c21-76a8-90e6-83fdaa90ee7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019cb454-9c21-7fc0-8c9f-767a07000eff" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019cb454-9c21-76a8-90e6-83fdaa90ee7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cb454-9c21-7464-94ef-6b2857b38228" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019cb454-9c21-76a8-90e6-83fdaa90ee7b" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cb454-9c21-7464-94ef-6b2857b38228" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019cb454-9c21-70e6-bfa4-3fdc705a35da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cb454-9c21-7464-94ef-6b2857b38228" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019cb454-9c21-70e6-bfa4-3fdc705a35da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019cb454-9c21-7854-9ef2-d93d9a9fb9c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cb454-9c21-7464-94ef-6b2857b38228" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_019cb454-9c21-7854-9ef2-d93d9a9fb9c9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_019cb454-9c21-7b44-a5b6-054b5b4c1805" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cb454-9c21-75bb-963b-152c5951340a" xlink:to="loc_us-gaap_AssetsAbstract_019cb454-9c21-7b44-a5b6-054b5b4c1805" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FHLBCommonStockFairValue_019cb454-9c21-7353-b947-b17e465d2a01" xlink:href="fg-20260331.xsd#fg_FHLBCommonStockFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9c21-7b44-a5b6-054b5b4c1805" xlink:to="loc_fg_FHLBCommonStockFairValue_019cb454-9c21-7353-b947-b17e465d2a01" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_InvestmentsCommercialMortgageLoansFairValueDisclosure_019cb454-9c21-78f9-9e4b-1d2367068e76" xlink:href="fg-20260331.xsd#fg_InvestmentsCommercialMortgageLoansFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9c21-7b44-a5b6-054b5b4c1805" xlink:to="loc_fg_InvestmentsCommercialMortgageLoansFairValueDisclosure_019cb454-9c21-78f9-9e4b-1d2367068e76" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_InvestmentsResidentialMortgageLoansFairValueDisclosure_019cb454-9c21-7c37-a574-d85f665d397c" xlink:href="fg-20260331.xsd#fg_InvestmentsResidentialMortgageLoansFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9c21-7b44-a5b6-054b5b4c1805" xlink:to="loc_fg_InvestmentsResidentialMortgageLoansFairValueDisclosure_019cb454-9c21-7c37-a574-d85f665d397c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentsFairValueDisclosure_019cb454-9c21-7670-b049-ed5e2d731b0f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9c21-7b44-a5b6-054b5b4c1805" xlink:to="loc_us-gaap_EquityMethodInvestmentsFairValueDisclosure_019cb454-9c21-7670-b049-ed5e2d731b0f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PolicyLoansFairValue_019cb454-9c21-7977-8443-0fd57911f76e" xlink:href="fg-20260331.xsd#fg_PolicyLoansFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9c21-7b44-a5b6-054b5b4c1805" xlink:to="loc_fg_PolicyLoansFairValue_019cb454-9c21-7977-8443-0fd57911f76e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankOwnedLifeInsurance_019cb454-9c21-7d4e-b255-d4f0970d2aa4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BankOwnedLifeInsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9c21-7b44-a5b6-054b5b4c1805" xlink:to="loc_us-gaap_BankOwnedLifeInsurance_019cb454-9c21-7d4e-b255-d4f0970d2aa4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_AssetsCarriedOnBalanceSheetAtAmountsOtherThanFairValue_019cb454-9c21-7039-9887-88a42e2c9b52" xlink:href="fg-20260331.xsd#fg_AssetsCarriedOnBalanceSheetAtAmountsOtherThanFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_019cb454-9c21-7b44-a5b6-054b5b4c1805" xlink:to="loc_fg_AssetsCarriedOnBalanceSheetAtAmountsOtherThanFairValue_019cb454-9c21-7039-9887-88a42e2c9b52" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_019cb454-9c21-78f2-a4b4-a026c5b4de2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_019cb454-9c21-75bb-963b-152c5951340a" xlink:to="loc_us-gaap_LiabilitiesAbstract_019cb454-9c21-78f2-a4b4-a026c5b4de2a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_LiabilitiesRelatedToInvestmentContractsOtherThanFairValueDisclosure_019cb454-9c21-7ac5-9fe9-9cbd19273a79" xlink:href="fg-20260331.xsd#fg_LiabilitiesRelatedToInvestmentContractsOtherThanFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019cb454-9c21-78f2-a4b4-a026c5b4de2a" xlink:to="loc_fg_LiabilitiesRelatedToInvestmentContractsOtherThanFairValueDisclosure_019cb454-9c21-7ac5-9fe9-9cbd19273a79" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFairValue_019cb454-9c21-7dd1-80ae-c0595a63a7fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019cb454-9c21-78f2-a4b4-a026c5b4de2a" xlink:to="loc_us-gaap_DebtInstrumentFairValue_019cb454-9c21-7dd1-80ae-c0595a63a7fd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_LiabilitiesCarriedOnBalanceSheetAtAmountsOtherThanFairValue_019cb454-9c21-7cd5-ad58-bbf31a663dfa" xlink:href="fg-20260331.xsd#fg_LiabilitiesCarriedOnBalanceSheetAtAmountsOtherThanFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_019cb454-9c21-78f2-a4b4-a026c5b4de2a" xlink:to="loc_fg_LiabilitiesCarriedOnBalanceSheetAtAmountsOtherThanFairValue_019cb454-9c21-7cd5-ad58-bbf31a663dfa" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/InvestmentsConsolidatedInvestmentsDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#InvestmentsConsolidatedInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/InvestmentsConsolidatedInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7795-abaa-0e3efd11bbac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-7bb5-9e4e-feb59d69b490" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7795-abaa-0e3efd11bbac" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-7bb5-9e4e-feb59d69b490" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019cb454-9c22-78e3-bbd6-05869b061186" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-7bb5-9e4e-feb59d69b490" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019cb454-9c22-78e3-bbd6-05869b061186" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-78e3-bbd6-05869b061186_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cb454-9c22-78e3-bbd6-05869b061186" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-78e3-bbd6-05869b061186_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-7dea-aa76-c0621610271b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cb454-9c22-78e3-bbd6-05869b061186" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-7dea-aa76-c0621610271b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019cb454-9c22-7744-a9d0-135561a61f41" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-7dea-aa76-c0621610271b" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019cb454-9c22-7744-a9d0-135561a61f41" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019cb454-9c22-7522-95ab-3ebe5cfffa5e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-7dea-aa76-c0621610271b" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019cb454-9c22-7522-95ab-3ebe5cfffa5e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019cb454-9c22-7623-b56d-1da9062e28fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-7dea-aa76-c0621610271b" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019cb454-9c22-7623-b56d-1da9062e28fc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_HybridsMember_019cb454-9c22-79d1-858b-ab1b5ec90878" xlink:href="fg-20260331.xsd#fg_HybridsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-7dea-aa76-c0621610271b" xlink:to="loc_fg_HybridsMember_019cb454-9c22-79d1-858b-ab1b5ec90878" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MunicipalsMember_019cb454-9c22-72e4-aaf3-c0f9bb402983" xlink:href="fg-20260331.xsd#fg_MunicipalsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-7dea-aa76-c0621610271b" xlink:to="loc_fg_MunicipalsMember_019cb454-9c22-72e4-aaf3-c0f9bb402983" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019cb454-9c22-7809-9603-58500a089fed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-7dea-aa76-c0621610271b" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019cb454-9c22-7809-9603-58500a089fed" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_019cb454-9c22-76d2-8035-369d33dee73b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-7dea-aa76-c0621610271b" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_019cb454-9c22-76d2-8035-369d33dee73b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019cb454-9c22-7b82-9aac-54ce2ad1d6b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-7dea-aa76-c0621610271b" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019cb454-9c22-7b82-9aac-54ce2ad1d6b1" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_019cb454-9c22-78a9-8a2c-047a5833f908" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7795-abaa-0e3efd11bbac" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_019cb454-9c22-78a9-8a2c-047a5833f908" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss_019cb454-9c22-7f05-bd57-786a38bed648" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_019cb454-9c22-78a9-8a2c-047a5833f908" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss_019cb454-9c22-7f05-bd57-786a38bed648" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_019cb454-9c22-76ac-9419-bef2f5c88ec2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_019cb454-9c22-78a9-8a2c-047a5833f908" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_019cb454-9c22-76ac-9419-bef2f5c88ec2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019cb454-9c22-7e35-8209-de2ea9dd1db0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_019cb454-9c22-78a9-8a2c-047a5833f908" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_019cb454-9c22-7e35-8209-de2ea9dd1db0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019cb454-9c22-771f-aadb-a0d8b89b0cd6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_019cb454-9c22-78a9-8a2c-047a5833f908" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_019cb454-9c22-771f-aadb-a0d8b89b0cd6" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019cb454-9c22-7c6b-a993-92da7e224b1f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesFairValueToAmortizedCostBasisAbstract_019cb454-9c22-78a9-8a2c-047a5833f908" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019cb454-9c22-7c6b-a993-92da7e224b1f" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/InvestmentsNarrativeDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#InvestmentsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/InvestmentsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7fa0-888a-8db96a8d61f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019cb454-9c22-7cc3-842d-0ea18f418891" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7fa0-888a-8db96a8d61f1" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019cb454-9c22-7cc3-842d-0ea18f418891" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7b47-98a6-efbb6096f282" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019cb454-9c22-7cc3-842d-0ea18f418891" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7b47-98a6-efbb6096f282" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7b47-98a6-efbb6096f282_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7b47-98a6-efbb6096f282" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7b47-98a6-efbb6096f282_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-72f3-a806-c0c15959e24d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7b47-98a6-efbb6096f282" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-72f3-a806-c0c15959e24d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_019cb454-9c22-7de8-9012-80ff2a758975" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-72f3-a806-c0c15959e24d" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_019cb454-9c22-7de8-9012-80ff2a758975" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019d499d-49ea-7fba-b0ec-0934f246792a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-72f3-a806-c0c15959e24d" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019d499d-49ea-7fba-b0ec-0934f246792a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019cb454-9c22-7473-8bc5-323f2d82af87" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019cb454-9c22-7cc3-842d-0ea18f418891" xlink:to="loc_srt_StatementGeographicalAxis_019cb454-9c22-7473-8bc5-323f2d82af87" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7473-8bc5-323f2d82af87_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019cb454-9c22-7473-8bc5-323f2d82af87" xlink:to="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7473-8bc5-323f2d82af87_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7e18-912b-67f028b22ca4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019cb454-9c22-7473-8bc5-323f2d82af87" xlink:to="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7e18-912b-67f028b22ca4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019cb454-9c22-7e08-afd9-4a9b8ef3dd9b" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7e18-912b-67f028b22ca4" xlink:to="loc_country_US_019cb454-9c22-7e08-afd9-4a9b8ef3dd9b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019cb454-9c22-7151-903f-7815e0bc1a31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019cb454-9c22-7cc3-842d-0ea18f418891" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019cb454-9c22-7151-903f-7815e0bc1a31" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cb454-9c22-7151-903f-7815e0bc1a31_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019cb454-9c22-7151-903f-7815e0bc1a31" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cb454-9c22-7151-903f-7815e0bc1a31_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cb454-9c22-7082-af98-cc6ff63c9391" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019cb454-9c22-7151-903f-7815e0bc1a31" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cb454-9c22-7082-af98-cc6ff63c9391" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_019cb454-9c22-7de9-8349-2eb54d1e3a0e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cb454-9c22-7082-af98-cc6ff63c9391" xlink:to="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_019cb454-9c22-7de9-8349-2eb54d1e3a0e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019cb454-9c22-7815-9a28-50dd48064b58" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019cb454-9c22-7cc3-842d-0ea18f418891" xlink:to="loc_us-gaap_InvestmentTypeAxis_019cb454-9c22-7815-9a28-50dd48064b58" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-7815-9a28-50dd48064b58_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019cb454-9c22-7815-9a28-50dd48064b58" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-7815-9a28-50dd48064b58_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-709d-a9bc-33bf87bfee68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019cb454-9c22-7815-9a28-50dd48064b58" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-709d-a9bc-33bf87bfee68" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FundsWithheldReinsuranceAgreementsMember_019cb454-9c22-7869-9c1b-7b3707b6d59f" xlink:href="fg-20260331.xsd#fg_FundsWithheldReinsuranceAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-709d-a9bc-33bf87bfee68" xlink:to="loc_fg_FundsWithheldReinsuranceAgreementsMember_019cb454-9c22-7869-9c1b-7b3707b6d59f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_019cb454-9c22-7767-a969-8cadca6cfc22" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019cb454-9c22-7cc3-842d-0ea18f418891" xlink:to="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_019cb454-9c22-7767-a969-8cadca6cfc22" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019cb454-9c22-7767-a969-8cadca6cfc22_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MortgageLoansOnRealEstateNamePropertyTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_019cb454-9c22-7767-a969-8cadca6cfc22" xlink:to="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019cb454-9c22-7767-a969-8cadca6cfc22_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019cb454-9c22-799c-bee2-7d0e4b61adca" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MortgageLoansOnRealEstateNamePropertyTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_019cb454-9c22-7767-a969-8cadca6cfc22" xlink:to="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019cb454-9c22-799c-bee2-7d0e4b61adca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_CommercialMortgageLoansMember_019cb454-9c22-70be-903e-62918fc3543c" xlink:href="fg-20260331.xsd#fg_CommercialMortgageLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019cb454-9c22-799c-bee2-7d0e4b61adca" xlink:to="loc_fg_CommercialMortgageLoansMember_019cb454-9c22-70be-903e-62918fc3543c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MortgageLoansMember_019cb454-9c22-7bcb-b1d3-ad5c09e7f212" xlink:href="fg-20260331.xsd#fg_MortgageLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019cb454-9c22-799c-bee2-7d0e4b61adca" xlink:to="loc_fg_MortgageLoansMember_019cb454-9c22-7bcb-b1d3-ad5c09e7f212" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019d44f1-c13e-7906-81b9-e9086fa59e4a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019cb454-9c22-7cc3-842d-0ea18f418891" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019d44f1-c13e-7906-81b9-e9086fa59e4a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019d44f1-c13e-7906-81b9-e9086fa59e4a_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019d44f1-c13e-7906-81b9-e9086fa59e4a" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019d44f1-c13e-7906-81b9-e9086fa59e4a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019d44f1-c13e-7e5e-aedf-0aba23ee2034" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019d44f1-c13e-7906-81b9-e9086fa59e4a" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019d44f1-c13e-7e5e-aedf-0aba23ee2034" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019d44f1-c13e-7af6-9c82-3f6e23365dd4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019d44f1-c13e-7e5e-aedf-0aba23ee2034" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019d44f1-c13e-7af6-9c82-3f6e23365dd4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuritiesHeldAsCollateralAtFairValue_019cb454-9c22-72d9-8e0d-5e93938acd1b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SecuritiesHeldAsCollateralAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7fa0-888a-8db96a8d61f1" xlink:to="loc_us-gaap_SecuritiesHeldAsCollateralAtFairValue_019cb454-9c22-72d9-8e0d-5e93938acd1b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_InvestmentNonIncomeProducingGreaterThanTwelveMonthsFairValueDisclosure_019cb454-9c22-797f-ab33-a09e5f867eaa" xlink:href="fg-20260331.xsd#fg_InvestmentNonIncomeProducingGreaterThanTwelveMonthsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7fa0-888a-8db96a8d61f1" xlink:to="loc_fg_InvestmentNonIncomeProducingGreaterThanTwelveMonthsFairValueDisclosure_019cb454-9c22-797f-ab33-a09e5f867eaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss_019cb454-9c22-72fb-9f36-bcbf57282a98" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7fa0-888a-8db96a8d61f1" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss_019cb454-9c22-72fb-9f36-bcbf57282a98" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList_019cb454-9c22-759b-bbfe-2e2cbeb95463" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7fa0-888a-8db96a8d61f1" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLossStatementOfFinancialPositionExtensibleList_019cb454-9c22-759b-bbfe-2e2cbeb95463" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1_019cb454-9c22-7b00-b106-6fd9ddb5a986" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7fa0-888a-8db96a8d61f1" xlink:to="loc_us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresCollateralPledged1_019cb454-9c22-7b00-b106-6fd9ddb5a986" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_019cb454-9c22-79a9-a110-504a1a30e387" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7fa0-888a-8db96a8d61f1" xlink:to="loc_us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAmountAtPurchasePrice_019cb454-9c22-79a9-a110-504a1a30e387" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAllowanceForCreditLossExcludingAccruedInterest_019cb454-9c22-7517-bc0a-2d01e4888306" xlink:href="fg-20260331.xsd#fg_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7fa0-888a-8db96a8d61f1" xlink:to="loc_fg_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAllowanceForCreditLossExcludingAccruedInterest_019cb454-9c22-7517-bc0a-2d01e4888306" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_CommercialMortgageLoansPercentageOfInvestments_019cb454-9c22-7a46-aed5-901c1f1de620" xlink:href="fg-20260331.xsd#fg_CommercialMortgageLoansPercentageOfInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7fa0-888a-8db96a8d61f1" xlink:to="loc_fg_CommercialMortgageLoansPercentageOfInvestments_019cb454-9c22-7a46-aed5-901c1f1de620" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DebtServiceCoverageRatioAmortizationPeriod_019cb454-9c22-7729-aabd-f81763cf1bc3" xlink:href="fg-20260331.xsd#fg_DebtServiceCoverageRatioAmortizationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7fa0-888a-8db96a8d61f1" xlink:to="loc_fg_DebtServiceCoverageRatioAmortizationPeriod_019cb454-9c22-7729-aabd-f81763cf1bc3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_NumberOfLoansDelinquentInPrincipalOrInterestPayments_019cb454-9c22-7e40-9057-aadb9726d32b" xlink:href="fg-20260331.xsd#fg_NumberOfLoansDelinquentInPrincipalOrInterestPayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7fa0-888a-8db96a8d61f1" xlink:to="loc_fg_NumberOfLoansDelinquentInPrincipalOrInterestPayments_019cb454-9c22-7e40-9057-aadb9726d32b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ResidentialMortgageReceivablePercentageofTotal_019cb454-9c22-76a6-9795-10cf57af7579" xlink:href="fg-20260331.xsd#fg_ResidentialMortgageReceivablePercentageofTotal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7fa0-888a-8db96a8d61f1" xlink:to="loc_fg_ResidentialMortgageReceivablePercentageofTotal_019cb454-9c22-76a6-9795-10cf57af7579" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ResidentialMortgageLoansLocationPercentage_019cb454-9c22-7a0e-8705-8a9643ad5f21" xlink:href="fg-20260331.xsd#fg_ResidentialMortgageLoansLocationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7fa0-888a-8db96a8d61f1" xlink:to="loc_fg_ResidentialMortgageLoansLocationPercentage_019cb454-9c22-7a0e-8705-8a9643ad5f21" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019cb454-9c22-7281-8259-668bbed4284e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7fa0-888a-8db96a8d61f1" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_019cb454-9c22-7281-8259-668bbed4284e" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual_019cb454-9c22-7a7a-b077-59ec816e11f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7fa0-888a-8db96a8d61f1" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual_019cb454-9c22-7a7a-b077-59ec816e11f3" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageLoansInProcessOfForeclosureAmount_019cb454-9c22-746f-a6b6-c2ba88d7e4cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgageLoansInProcessOfForeclosureAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7fa0-888a-8db96a8d61f1" xlink:to="loc_us-gaap_MortgageLoansInProcessOfForeclosureAmount_019cb454-9c22-746f-a6b6-c2ba88d7e4cf" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableAllowanceForCreditLossProbabilityOfLossDefaultModelProjectedLossUsingReasonableAndSupportableForecastPeriod_019cb454-9c22-750a-b8d1-3c850cb315f0" xlink:href="fg-20260331.xsd#fg_FinancingReceivableAllowanceForCreditLossProbabilityOfLossDefaultModelProjectedLossUsingReasonableAndSupportableForecastPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7fa0-888a-8db96a8d61f1" xlink:to="loc_fg_FinancingReceivableAllowanceForCreditLossProbabilityOfLossDefaultModelProjectedLossUsingReasonableAndSupportableForecastPeriod_019cb454-9c22-750a-b8d1-3c850cb315f0" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableAllowanceForCreditLossProbabilityOfProjectedLossDefaultProjectionModelUsingMarketHistoricalLossPeriod_019cb454-9c22-7afd-8c04-08db7cc9f369" xlink:href="fg-20260331.xsd#fg_FinancingReceivableAllowanceForCreditLossProbabilityOfProjectedLossDefaultProjectionModelUsingMarketHistoricalLossPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7fa0-888a-8db96a8d61f1" xlink:to="loc_fg_FinancingReceivableAllowanceForCreditLossProbabilityOfProjectedLossDefaultProjectionModelUsingMarketHistoricalLossPeriod_019cb454-9c22-7afd-8c04-08db7cc9f369" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss_019cb454-9c22-7d88-9616-958cf2eae9a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7fa0-888a-8db96a8d61f1" xlink:to="loc_us-gaap_FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss_019cb454-9c22-7d88-9616-958cf2eae9a0" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossInvestmentIncomeOperating_019cb454-9c22-7ae1-a6a1-36601656c6f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GrossInvestmentIncomeOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7fa0-888a-8db96a8d61f1" xlink:to="loc_us-gaap_GrossInvestmentIncomeOperating_019cb454-9c22-7ae1-a6a1-36601656c6f8" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ReinsuranceAgreementRecognizedGainsLosses_019cb454-9c22-7ee4-acfe-cb50277136ef" xlink:href="fg-20260331.xsd#fg_ReinsuranceAgreementRecognizedGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7fa0-888a-8db96a8d61f1" xlink:to="loc_fg_ReinsuranceAgreementRecognizedGainsLosses_019cb454-9c22-7ee4-acfe-cb50277136ef" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_019d44f1-c13e-75b4-b4e2-f73d5aa1885a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7fa0-888a-8db96a8d61f1" xlink:to="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_019d44f1-c13e-75b4-b4e2-f73d5aa1885a" xlink:type="arc" order="20"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/InvestmentsAmortizedCostandFairValueofFixedMaturitybyContractualMaturityDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#InvestmentsAmortizedCostandFairValueofFixedMaturitybyContractualMaturityDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/InvestmentsAmortizedCostandFairValueofFixedMaturitybyContractualMaturityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7828-ad06-3d71110b6396" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019cb454-9c22-7a20-a91b-ade7937d307d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7828-ad06-3d71110b6396" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019cb454-9c22-7a20-a91b-ade7937d307d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019cb454-9c22-79c7-8a72-107fb499a2bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleTable_019cb454-9c22-7a20-a91b-ade7937d307d" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019cb454-9c22-79c7-8a72-107fb499a2bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-79c7-8a72-107fb499a2bf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cb454-9c22-79c7-8a72-107fb499a2bf" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-79c7-8a72-107fb499a2bf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-78b6-88e1-fd866e5be0a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cb454-9c22-79c7-8a72-107fb499a2bf" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-78b6-88e1-fd866e5be0a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019cb454-9c22-7414-a5d6-c4fcd0ac6a1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-78b6-88e1-fd866e5be0a3" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019cb454-9c22-7414-a5d6-c4fcd0ac6a1e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019cb454-9c22-7120-8220-01eefa06ba82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-78b6-88e1-fd866e5be0a3" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019cb454-9c22-7120-8220-01eefa06ba82" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_019cb454-9c22-7cfb-8d8f-86ad490c1192" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-78b6-88e1-fd866e5be0a3" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_019cb454-9c22-7cfb-8d8f-86ad490c1192" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_019cb454-9c22-766b-ae41-904e867c9120" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7828-ad06-3d71110b6396" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_019cb454-9c22-766b-ae41-904e867c9120" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_019cb454-9c22-7c78-a733-f3662c5648b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7828-ad06-3d71110b6396" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_019cb454-9c22-7c78-a733-f3662c5648b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_019cb454-9c22-70d8-9c1e-fa34d2bbbc39" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7828-ad06-3d71110b6396" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_019cb454-9c22-70d8-9c1e-fa34d2bbbc39" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_019cb454-9c22-7f9f-80d1-e456b099613f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7828-ad06-3d71110b6396" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_019cb454-9c22-7f9f-80d1-e456b099613f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_019cb454-9c22-7445-8087-86fc327c195a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7828-ad06-3d71110b6396" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDateAmortizedCostBasis_019cb454-9c22-7445-8087-86fc327c195a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_019cb454-9c22-7c69-9e36-ac2827f612ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7828-ad06-3d71110b6396" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateAmortizedCost_019cb454-9c22-7c69-9e36-ac2827f612ea" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss_019cb454-9c22-709b-a505-042d2dfdac72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7828-ad06-3d71110b6396" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss_019cb454-9c22-709b-a505-042d2dfdac72" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_019cb454-9c22-751e-9ffb-0a1291493e1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7828-ad06-3d71110b6396" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_019cb454-9c22-751e-9ffb-0a1291493e1d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_019cb454-9c22-7cee-8938-8fa331305cd7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7828-ad06-3d71110b6396" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_019cb454-9c22-7cee-8938-8fa331305cd7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_019cb454-9c22-77bb-9b62-03ba8289fd40" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7828-ad06-3d71110b6396" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_019cb454-9c22-77bb-9b62-03ba8289fd40" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_019cb454-9c22-7db3-9b72-f950cd84fdb0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7828-ad06-3d71110b6396" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_019cb454-9c22-7db3-9b72-f950cd84fdb0" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_019cb454-9c22-7ac2-9407-61fa5a601a46" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7828-ad06-3d71110b6396" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesSingleMaturityDate_019cb454-9c22-7ac2-9407-61fa5a601a46" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_019cb454-9c22-7b8f-8e8e-852fe2d123d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7828-ad06-3d71110b6396" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithoutSingleMaturityDateFairValue_019cb454-9c22-7b8f-8e8e-852fe2d123d8" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019cb454-9c22-7933-a128-660db1b3a106" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_019cb454-9c22-7828-ad06-3d71110b6396" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019cb454-9c22-7933-a128-660db1b3a106" xlink:type="arc" order="13"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/InvestmentsActivityinAllowanceforCreditLossAggregatedbyInvestmentCategoryDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#InvestmentsActivityinAllowanceforCreditLossAggregatedbyInvestmentCategoryDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/InvestmentsActivityinAllowanceforCreditLossAggregatedbyInvestmentCategoryDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableforsaleAllowanceForCreditLossLineItems_019cb454-9c22-7776-b81a-b762c9ab0b1a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableforsaleAllowanceForCreditLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossTable_019cb454-9c22-7003-a7e0-1e7049465e56" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtSecuritiesAvailableforsaleAllowanceForCreditLossLineItems_019cb454-9c22-7776-b81a-b762c9ab0b1a" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossTable_019cb454-9c22-7003-a7e0-1e7049465e56" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019cb454-9c22-71fd-a139-88de8ff43264" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossTable_019cb454-9c22-7003-a7e0-1e7049465e56" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019cb454-9c22-71fd-a139-88de8ff43264" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-71fd-a139-88de8ff43264_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cb454-9c22-71fd-a139-88de8ff43264" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-71fd-a139-88de8ff43264_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-7660-9105-5458a4764ba5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cb454-9c22-71fd-a139-88de8ff43264" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-7660-9105-5458a4764ba5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019cb454-9c22-7cd5-8759-292ef6cdcc53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-7660-9105-5458a4764ba5" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019cb454-9c22-7cd5-8759-292ef6cdcc53" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019cb454-9c22-7d78-b303-d41e0e4cd49e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-7660-9105-5458a4764ba5" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019cb454-9c22-7d78-b303-d41e0e4cd49e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019cb454-9c22-7a4a-8643-ffdec9a1519a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-7660-9105-5458a4764ba5" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019cb454-9c22-7a4a-8643-ffdec9a1519a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019cb454-9c22-72b9-b223-08ebb367f24a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-7660-9105-5458a4764ba5" xlink:to="loc_us-gaap_ResidentialMortgageBackedSecuritiesMember_019cb454-9c22-72b9-b223-08ebb367f24a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward_019cb454-9c22-7648-9eab-a78bf0c5a335" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableforsaleAllowanceForCreditLossLineItems_019cb454-9c22-7776-b81a-b762c9ab0b1a" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward_019cb454-9c22-7648-9eab-a78bf0c5a335" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_019cb454-9c22-7b94-afd1-cd33ce690e93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward_019cb454-9c22-7648-9eab-a78bf0c5a335" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_019cb454-9c22-7b94-afd1-cd33ce690e93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DebtSecuritiesAvailableForSaleAllowanceForCreditLossExcludingAccruedInterestAdditionsAbstract_019cb454-9c22-7ddc-9be5-1c63cacdf9ed" xlink:href="fg-20260331.xsd#fg_DebtSecuritiesAvailableForSaleAllowanceForCreditLossExcludingAccruedInterestAdditionsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward_019cb454-9c22-7648-9eab-a78bf0c5a335" xlink:to="loc_fg_DebtSecuritiesAvailableForSaleAllowanceForCreditLossExcludingAccruedInterestAdditionsAbstract_019cb454-9c22-7ddc-9be5-1c63cacdf9ed" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossNotPreviouslyRecorded_019cb454-9c22-7835-abf9-8c7ef18fcc5a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossNotPreviouslyRecorded"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_DebtSecuritiesAvailableForSaleAllowanceForCreditLossExcludingAccruedInterestAdditionsAbstract_019cb454-9c22-7ddc-9be5-1c63cacdf9ed" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossNotPreviouslyRecorded_019cb454-9c22-7835-abf9-8c7ef18fcc5a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal_019cb454-9c22-7173-961f-d567fd39e4c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_DebtSecuritiesAvailableForSaleAllowanceForCreditLossExcludingAccruedInterestAdditionsAbstract_019cb454-9c22-7ddc-9be5-1c63cacdf9ed" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal_019cb454-9c22-7173-961f-d567fd39e4c8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DebtSecuritiesAvailableForSaleAllowanceForCreditLossExcludingAccruedInterestReductionsAbstract_019cb454-9c22-77e8-9cbe-da8133ea155b" xlink:href="fg-20260331.xsd#fg_DebtSecuritiesAvailableForSaleAllowanceForCreditLossExcludingAccruedInterestReductionsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleAllowanceForCreditLossRollForward_019cb454-9c22-7648-9eab-a78bf0c5a335" xlink:to="loc_fg_DebtSecuritiesAvailableForSaleAllowanceForCreditLossExcludingAccruedInterestReductionsAbstract_019cb454-9c22-77e8-9cbe-da8133ea155b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossSecuritiesSold_019cb454-9c22-7efd-a9ce-79769ddc15c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossSecuritiesSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_DebtSecuritiesAvailableForSaleAllowanceForCreditLossExcludingAccruedInterestReductionsAbstract_019cb454-9c22-77e8-9cbe-da8133ea155b" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossSecuritiesSold_019cb454-9c22-7efd-a9ce-79769ddc15c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossSellBeforeRecovery_019cb454-9c22-7817-80b9-4ad206924382" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossSellBeforeRecovery"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_DebtSecuritiesAvailableForSaleAllowanceForCreditLossExcludingAccruedInterestReductionsAbstract_019cb454-9c22-77e8-9cbe-da8133ea155b" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossSellBeforeRecovery_019cb454-9c22-7817-80b9-4ad206924382" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossWriteoff_019cb454-9c22-7ba7-9daa-dab6199bbc87" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_DebtSecuritiesAvailableForSaleAllowanceForCreditLossExcludingAccruedInterestReductionsAbstract_019cb454-9c22-77e8-9cbe-da8133ea155b" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossWriteoff_019cb454-9c22-7ba7-9daa-dab6199bbc87" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossRecovery_019cb454-9c22-7605-8bef-ec4850c6eb8e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossRecovery"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_DebtSecuritiesAvailableForSaleAllowanceForCreditLossExcludingAccruedInterestReductionsAbstract_019cb454-9c22-77e8-9cbe-da8133ea155b" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossRecovery_019cb454-9c22-7605-8bef-ec4850c6eb8e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_019cb454-9c22-78d2-a61c-f08a178a9424" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/InvestmentsFairValueandGrossUnrealizedLossesofAvailableforSaleSecuritiesDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#InvestmentsFairValueandGrossUnrealizedLossesofAvailableforSaleSecuritiesDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/InvestmentsFairValueandGrossUnrealizedLossesofAvailableforSaleSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_019cb454-9c22-7f93-bf8d-1cbc9cba6f37" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTable_019cb454-9c22-733e-9d82-e646c11381d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_019cb454-9c22-7f93-bf8d-1cbc9cba6f37" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTable_019cb454-9c22-733e-9d82-e646c11381d4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_019cb454-9c22-772a-9c7c-7ec5bed34aea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionFairValueTable_019cb454-9c22-733e-9d82-e646c11381d4" xlink:to="loc_us-gaap_FinancialInstrumentAxis_019cb454-9c22-772a-9c7c-7ec5bed34aea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-772a-9c7c-7ec5bed34aea_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cb454-9c22-772a-9c7c-7ec5bed34aea" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-772a-9c7c-7ec5bed34aea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-72a9-abc8-71b10e5cb866" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_019cb454-9c22-772a-9c7c-7ec5bed34aea" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-72a9-abc8-71b10e5cb866" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_019cb454-9c22-73d5-b29e-d8d7efd79304" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-72a9-abc8-71b10e5cb866" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_019cb454-9c22-73d5-b29e-d8d7efd79304" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019cb454-9c22-7b81-91aa-f64ff4b72d3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-72a9-abc8-71b10e5cb866" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_019cb454-9c22-7b81-91aa-f64ff4b72d3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateDebtSecuritiesMember_019cb454-9c22-7caa-9e52-dbe3280eae02" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CorporateDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-72a9-abc8-71b10e5cb866" xlink:to="loc_us-gaap_CorporateDebtSecuritiesMember_019cb454-9c22-7caa-9e52-dbe3280eae02" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_HybridsMember_019cb454-9c22-709f-b7b1-749353f0fb56" xlink:href="fg-20260331.xsd#fg_HybridsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-72a9-abc8-71b10e5cb866" xlink:to="loc_fg_HybridsMember_019cb454-9c22-709f-b7b1-749353f0fb56" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019cb454-9c22-75e7-9963-bbd35b7b2031" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-72a9-abc8-71b10e5cb866" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_019cb454-9c22-75e7-9963-bbd35b7b2031" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_019cb454-9c22-76e1-ac17-50fedabce67e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-72a9-abc8-71b10e5cb866" xlink:to="loc_us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember_019cb454-9c22-76e1-ac17-50fedabce67e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_019cb454-9c22-75a2-8431-d9d951d577a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USGovernmentAgenciesDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-72a9-abc8-71b10e5cb866" xlink:to="loc_us-gaap_USGovernmentAgenciesDebtSecuritiesMember_019cb454-9c22-75a2-8431-d9d951d577a8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019cb454-9c22-738f-bb5d-3ceb7c92ec00" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ForeignGovernmentDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_019cb454-9c22-72a9-abc8-71b10e5cb866" xlink:to="loc_us-gaap_ForeignGovernmentDebtSecuritiesMember_019cb454-9c22-738f-bb5d-3ceb7c92ec00" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_019cb454-9c22-7314-8e54-9bc3bb6b2dea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_019cb454-9c22-7f93-bf8d-1cbc9cba6f37" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_019cb454-9c22-7314-8e54-9bc3bb6b2dea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_019cb454-9c22-7429-922d-f20fa9ed9b68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_019cb454-9c22-7f93-bf8d-1cbc9cba6f37" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_019cb454-9c22-7429-922d-f20fa9ed9b68" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_019cb454-9c22-73c8-8b8c-66dd07024d3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_019cb454-9c22-7f93-bf8d-1cbc9cba6f37" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_019cb454-9c22-73c8-8b8c-66dd07024d3d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_019cb454-9c22-7254-99c3-125180c5a98f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_019cb454-9c22-7f93-bf8d-1cbc9cba6f37" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_019cb454-9c22-7254-99c3-125180c5a98f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_019cb454-9c22-78c8-a398-fa6e205d5806" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_019cb454-9c22-7f93-bf8d-1cbc9cba6f37" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition_019cb454-9c22-78c8-a398-fa6e205d5806" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_019cb454-9c22-7354-be29-edf3c673de35" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_019cb454-9c22-7f93-bf8d-1cbc9cba6f37" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_019cb454-9c22-7354-be29-edf3c673de35" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions_019cb454-9c22-776f-b43f-3a4effac32bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_019cb454-9c22-7f93-bf8d-1cbc9cba6f37" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions_019cb454-9c22-776f-b43f-3a4effac32bc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions_019cb454-9c22-7a1d-b559-83d216d9cab7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_019cb454-9c22-7f93-bf8d-1cbc9cba6f37" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions_019cb454-9c22-7a1d-b559-83d216d9cab7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions_019cb454-9c22-7457-9108-375d09641780" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract_019cb454-9c22-7f93-bf8d-1cbc9cba6f37" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions_019cb454-9c22-7457-9108-375d09641780" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/InvestmentsDistributionofCommercialMortgageLoanGrossofValuationAllowancesbyPropertyTypeandRegionDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#InvestmentsDistributionofCommercialMortgageLoanGrossofValuationAllowancesbyPropertyTypeandRegionDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/InvestmentsDistributionofCommercialMortgageLoanGrossofValuationAllowancesbyPropertyTypeandRegionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7b24-8bdf-5df750b209db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-74fc-a824-2b5e1d415362" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7b24-8bdf-5df750b209db" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-74fc-a824-2b5e1d415362" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_019cb454-9c22-7f16-9bfa-542104dfdb08" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-74fc-a824-2b5e1d415362" xlink:to="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_019cb454-9c22-7f16-9bfa-542104dfdb08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019cb454-9c22-7f16-9bfa-542104dfdb08_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MortgageLoansOnRealEstateNamePropertyTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_019cb454-9c22-7f16-9bfa-542104dfdb08" xlink:to="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019cb454-9c22-7f16-9bfa-542104dfdb08_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019cb454-9c22-791b-872e-83b564eae44b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MortgageLoansOnRealEstateNamePropertyTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis_019cb454-9c22-7f16-9bfa-542104dfdb08" xlink:to="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019cb454-9c22-791b-872e-83b564eae44b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_HotelMember_019cb454-9c22-7f11-a7a1-9561186d18d6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_HotelMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019cb454-9c22-791b-872e-83b564eae44b" xlink:to="loc_srt_HotelMember_019cb454-9c22-7f11-a7a1-9561186d18d6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_IndustrialGeneralMember_019cb454-9c22-76b3-9f1c-6120aa26babc" xlink:href="fg-20260331.xsd#fg_IndustrialGeneralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019cb454-9c22-791b-872e-83b564eae44b" xlink:to="loc_fg_IndustrialGeneralMember_019cb454-9c22-76b3-9f1c-6120aa26babc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MixedUsePropertyMember_019cb454-9c22-7bf3-ad7c-649be93da908" xlink:href="fg-20260331.xsd#fg_MixedUsePropertyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019cb454-9c22-791b-872e-83b564eae44b" xlink:to="loc_fg_MixedUsePropertyMember_019cb454-9c22-7bf3-ad7c-649be93da908" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MultifamilyMember_019cb454-9c22-78a6-8d3a-c13755c7b215" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MultifamilyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019cb454-9c22-791b-872e-83b564eae44b" xlink:to="loc_srt_MultifamilyMember_019cb454-9c22-78a6-8d3a-c13755c7b215" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OfficeBuildingMember_019cb454-9c22-76b9-97e0-1915211185a3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OfficeBuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019cb454-9c22-791b-872e-83b564eae44b" xlink:to="loc_srt_OfficeBuildingMember_019cb454-9c22-76b9-97e0-1915211185a3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RetailSiteMember_019cb454-9c22-7961-acf1-7f4d2ec08a02" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RetailSiteMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019cb454-9c22-791b-872e-83b564eae44b" xlink:to="loc_srt_RetailSiteMember_019cb454-9c22-7961-acf1-7f4d2ec08a02" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_StudentHousingMember_019cb454-9c22-7295-8cb8-60005d183b02" xlink:href="fg-20260331.xsd#fg_StudentHousingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019cb454-9c22-791b-872e-83b564eae44b" xlink:to="loc_fg_StudentHousingMember_019cb454-9c22-7295-8cb8-60005d183b02" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OtherPropertyMember_019cb454-9c22-7455-af86-13e85ebd4130" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OtherPropertyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_MortgageLoansOnRealEstateNamePropertyTypeDomain_019cb454-9c22-791b-872e-83b564eae44b" xlink:to="loc_srt_OtherPropertyMember_019cb454-9c22-7455-af86-13e85ebd4130" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019cb454-9c22-71fa-8c09-84de47a8cdc1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-74fc-a824-2b5e1d415362" xlink:to="loc_srt_StatementGeographicalAxis_019cb454-9c22-71fa-8c09-84de47a8cdc1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019cb454-9c22-71fa-8c09-84de47a8cdc1_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019cb454-9c22-71fa-8c09-84de47a8cdc1" xlink:to="loc_srt_SegmentGeographicalDomain_019cb454-9c22-71fa-8c09-84de47a8cdc1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7bbe-9e71-937f3dfaa90a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019cb454-9c22-71fa-8c09-84de47a8cdc1" xlink:to="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7bbe-9e71-937f3dfaa90a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_EastNorthCentralUSMember_019cb454-9c22-70b4-b352-125d54e45aae" xlink:href="fg-20260331.xsd#fg_EastNorthCentralUSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7bbe-9e71-937f3dfaa90a" xlink:to="loc_fg_EastNorthCentralUSMember_019cb454-9c22-70b4-b352-125d54e45aae" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_EastSouthCentralMember_019cb454-9c22-7eb9-a278-577f5aedb432" xlink:href="fg-20260331.xsd#fg_EastSouthCentralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7bbe-9e71-937f3dfaa90a" xlink:to="loc_fg_EastSouthCentralMember_019cb454-9c22-7eb9-a278-577f5aedb432" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MiddleAtlanticUSMember_019cb454-9c22-7884-a97e-5091f992f3d7" xlink:href="fg-20260331.xsd#fg_MiddleAtlanticUSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7bbe-9e71-937f3dfaa90a" xlink:to="loc_fg_MiddleAtlanticUSMember_019cb454-9c22-7884-a97e-5091f992f3d7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MountainMember_019cb454-9c22-7f80-9f32-c22ab85157e9" xlink:href="fg-20260331.xsd#fg_MountainMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7bbe-9e71-937f3dfaa90a" xlink:to="loc_fg_MountainMember_019cb454-9c22-7f80-9f32-c22ab85157e9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_NewEnglandMember_019cb454-9c22-7cda-b35a-3990580c1588" xlink:href="fg-20260331.xsd#fg_NewEnglandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7bbe-9e71-937f3dfaa90a" xlink:to="loc_fg_NewEnglandMember_019cb454-9c22-7cda-b35a-3990580c1588" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PacificUSMember_019cb454-9c22-722c-9cf0-66e742bd539d" xlink:href="fg-20260331.xsd#fg_PacificUSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7bbe-9e71-937f3dfaa90a" xlink:to="loc_fg_PacificUSMember_019cb454-9c22-722c-9cf0-66e742bd539d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_SouthAtlanticUSMember_019cb454-9c22-70ed-8052-d751db1e6052" xlink:href="fg-20260331.xsd#fg_SouthAtlanticUSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7bbe-9e71-937f3dfaa90a" xlink:to="loc_fg_SouthAtlanticUSMember_019cb454-9c22-70ed-8052-d751db1e6052" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_WestNorthCentralUSMember_019cb454-9c22-7492-9682-b6cf2502d951" xlink:href="fg-20260331.xsd#fg_WestNorthCentralUSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7bbe-9e71-937f3dfaa90a" xlink:to="loc_fg_WestNorthCentralUSMember_019cb454-9c22-7492-9682-b6cf2502d951" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_WestSouthCentralUSMember_019cb454-9c22-7ac6-a461-afdd6889f1ae" xlink:href="fg-20260331.xsd#fg_WestSouthCentralUSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7bbe-9e71-937f3dfaa90a" xlink:to="loc_fg_WestSouthCentralUSMember_019cb454-9c22-7ac6-a461-afdd6889f1ae" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7076-b520-67d92555f918" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-74fc-a824-2b5e1d415362" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7076-b520-67d92555f918" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7076-b520-67d92555f918_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7076-b520-67d92555f918" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7076-b520-67d92555f918_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7efc-86cd-e71a03c9017b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7076-b520-67d92555f918" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7efc-86cd-e71a03c9017b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019cb454-9c22-7b02-ba4b-db28fb81e4a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7efc-86cd-e71a03c9017b" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019cb454-9c22-7b02-ba4b-db28fb81e4a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019cb454-9c22-701c-b550-886cd9fc5c4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7b24-8bdf-5df750b209db" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019cb454-9c22-701c-b550-886cd9fc5c4d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent_019cb454-9c22-7a41-a8fe-f622f8b34e9d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7b24-8bdf-5df750b209db" xlink:to="loc_srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent_019cb454-9c22-7a41-a8fe-f622f8b34e9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019cb454-9c22-7d6a-89e8-76c968b6d1f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7b24-8bdf-5df750b209db" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019cb454-9c22-7d6a-89e8-76c968b6d1f3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019cb454-9c22-7897-a77a-c5d037ee7339" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7b24-8bdf-5df750b209db" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019cb454-9c22-7897-a77a-c5d037ee7339" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/InvestmentsCommercialMortgageLoansSegregatedbyAgingofLoansandChargeOffsDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#InvestmentsCommercialMortgageLoansSegregatedbyAgingofLoansandChargeOffsDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/InvestmentsCommercialMortgageLoansSegregatedbyAgingofLoansandChargeOffsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cb454-9c22-7d98-80a0-70441fea87dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_019cb454-9c22-713e-9e4e-9ca7c1738d0e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cb454-9c22-7d98-80a0-70441fea87dc" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_019cb454-9c22-713e-9e4e-9ca7c1738d0e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-759b-87b1-914d604408fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_019cb454-9c22-713e-9e4e-9ca7c1738d0e" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-759b-87b1-914d604408fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-759b-87b1-914d604408fd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-759b-87b1-914d604408fd" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-759b-87b1-914d604408fd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-762a-9764-ae3e7b3f56ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-759b-87b1-914d604408fd" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-762a-9764-ae3e7b3f56ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019cb454-9c22-742b-b2b9-ea7b9d010abc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-762a-9764-ae3e7b3f56ef" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019cb454-9c22-742b-b2b9-ea7b9d010abc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019cb454-9c22-70a6-82a3-ee135c4b36e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableRecordedInvestmentCreditQualityIndicatorTable_019cb454-9c22-713e-9e4e-9ca7c1738d0e" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019cb454-9c22-70a6-82a3-ee135c4b36e4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cb454-9c22-70a6-82a3-ee135c4b36e4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019cb454-9c22-70a6-82a3-ee135c4b36e4" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cb454-9c22-70a6-82a3-ee135c4b36e4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cb454-9c22-79d8-92d3-8d4e8503cd0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019cb454-9c22-70a6-82a3-ee135c4b36e4" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cb454-9c22-79d8-92d3-8d4e8503cd0c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables1To29DaysPastDueMember_019cb454-9c22-7e03-9ed2-71d69cb3f988" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivables1To29DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cb454-9c22-79d8-92d3-8d4e8503cd0c" xlink:to="loc_us-gaap_FinancingReceivables1To29DaysPastDueMember_019cb454-9c22-7e03-9ed2-71d69cb3f988" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancialAsset30To89DaysPastDueMember_019cb454-9c22-7e4c-b4f3-a668f9742ce1" xlink:href="fg-20260331.xsd#fg_FinancialAsset30To89DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cb454-9c22-79d8-92d3-8d4e8503cd0c" xlink:to="loc_fg_FinancialAsset30To89DaysPastDueMember_019cb454-9c22-7e4c-b4f3-a668f9742ce1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_019cb454-9c22-7ad9-85ad-af1c71bb3d15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cb454-9c22-79d8-92d3-8d4e8503cd0c" xlink:to="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_019cb454-9c22-7ad9-85ad-af1c71bb3d15" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-7132-a637-ac76365518a4" xlink:href="fg-20260331.xsd#fg_CreditQualityIndicatorCurrentYearAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cb454-9c22-7d98-80a0-70441fea87dc" xlink:to="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-7132-a637-ac76365518a4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_019cb454-9c22-79c7-bed6-f20f96ad031d" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-7132-a637-ac76365518a4" xlink:to="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_019cb454-9c22-79c7-bed6-f20f96ad031d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_019cb454-9c22-79b5-8e7a-b6fce8e00fbd" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-7132-a637-ac76365518a4" xlink:to="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_019cb454-9c22-79b5-8e7a-b6fce8e00fbd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_019cb454-9c22-7111-829b-56531e9286ed" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-7132-a637-ac76365518a4" xlink:to="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_019cb454-9c22-7111-829b-56531e9286ed" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_019cb454-9c22-769b-a25e-4d02a2280dfa" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-7132-a637-ac76365518a4" xlink:to="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_019cb454-9c22-769b-a25e-4d02a2280dfa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_019cb454-9c22-7b6b-9248-4c9256d350be" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-7132-a637-ac76365518a4" xlink:to="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_019cb454-9c22-7b6b-9248-4c9256d350be" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_019cb454-9c22-7363-ae48-34a512c089bc" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-7132-a637-ac76365518a4" xlink:to="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_019cb454-9c22-7363-ae48-34a512c089bc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess_019cb454-9c22-78ce-b87d-f9ffb110260d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-7132-a637-ac76365518a4" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess_019cb454-9c22-78ce-b87d-f9ffb110260d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_CreditQualityIndicatorPriorYearAbstract_019cb454-9c22-7f3e-8416-a990915845cf" xlink:href="fg-20260331.xsd#fg_CreditQualityIndicatorPriorYearAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentLineItems_019cb454-9c22-7d98-80a0-70441fea87dc" xlink:to="loc_fg_CreditQualityIndicatorPriorYearAbstract_019cb454-9c22-7f3e-8416-a990915845cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_019cb454-9c22-74f8-af95-3c663ac6cdc4" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_019cb454-9c22-7f28-a6be-d168ca53b983" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_019cb454-9c22-791d-a5f0-52279e4cd71b" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_019cb454-9c22-7aa5-aa41-f75cecf58321" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_019cb454-9c22-7fe7-b745-e197d14d4074" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_019cb454-9c22-799d-a2e6-2b1cd3e7d480" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess_019cb454-9c22-78a7-acbd-fe26bbd3abb1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/InvestmentsScheduleofInvestmentinCMLsbyLoantoValueandDebtServiceCoverageRatiosDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#InvestmentsScheduleofInvestmentinCMLsbyLoantoValueandDebtServiceCoverageRatiosDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/InvestmentsScheduleofInvestmentinCMLsbyLoantoValueandDebtServiceCoverageRatiosDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7fa7-a34d-54178a2f64a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-74a8-93d4-7e3f3f711c75" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7fa7-a34d-54178a2f64a8" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-74a8-93d4-7e3f3f711c75" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DebtServiceCoverageRatioAxis_019cb454-9c22-7638-b496-95ee17f192e5" xlink:href="fg-20260331.xsd#fg_DebtServiceCoverageRatioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-74a8-93d4-7e3f3f711c75" xlink:to="loc_fg_DebtServiceCoverageRatioAxis_019cb454-9c22-7638-b496-95ee17f192e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DebtServiceCoverageRatioDomain_019cb454-9c22-7638-b496-95ee17f192e5_default" xlink:href="fg-20260331.xsd#fg_DebtServiceCoverageRatioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_fg_DebtServiceCoverageRatioAxis_019cb454-9c22-7638-b496-95ee17f192e5" xlink:to="loc_fg_DebtServiceCoverageRatioDomain_019cb454-9c22-7638-b496-95ee17f192e5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DebtServiceCoverageRatioDomain_019cb454-9c22-7261-9e20-c0dcbfd6a9f5" xlink:href="fg-20260331.xsd#fg_DebtServiceCoverageRatioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_fg_DebtServiceCoverageRatioAxis_019cb454-9c22-7638-b496-95ee17f192e5" xlink:to="loc_fg_DebtServiceCoverageRatioDomain_019cb454-9c22-7261-9e20-c0dcbfd6a9f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_GreaterThanOnePointTwoFiveMember_019cb454-9c22-7e91-8e67-6fba22018bef" xlink:href="fg-20260331.xsd#fg_GreaterThanOnePointTwoFiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_DebtServiceCoverageRatioDomain_019cb454-9c22-7261-9e20-c0dcbfd6a9f5" xlink:to="loc_fg_GreaterThanOnePointTwoFiveMember_019cb454-9c22-7e91-8e67-6fba22018bef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_GreaterThanOneButLessThanOnePointTwoFiveMember_019cb454-9c22-7d51-b18d-c3f4335ddc9b" xlink:href="fg-20260331.xsd#fg_GreaterThanOneButLessThanOnePointTwoFiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_DebtServiceCoverageRatioDomain_019cb454-9c22-7261-9e20-c0dcbfd6a9f5" xlink:to="loc_fg_GreaterThanOneButLessThanOnePointTwoFiveMember_019cb454-9c22-7d51-b18d-c3f4335ddc9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_LessThanOnePointZeroZeroMember_019cb454-9c22-7d48-a2da-cbf84b627804" xlink:href="fg-20260331.xsd#fg_LessThanOnePointZeroZeroMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_DebtServiceCoverageRatioDomain_019cb454-9c22-7261-9e20-c0dcbfd6a9f5" xlink:to="loc_fg_LessThanOnePointZeroZeroMember_019cb454-9c22-7d48-a2da-cbf84b627804" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7f15-8d46-809146dce47a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-74a8-93d4-7e3f3f711c75" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7f15-8d46-809146dce47a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7f15-8d46-809146dce47a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7f15-8d46-809146dce47a" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7f15-8d46-809146dce47a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7c01-98aa-fd86ff66f9e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7f15-8d46-809146dce47a" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7c01-98aa-fd86ff66f9e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019cb454-9c22-77b9-bc20-00a99c88d60d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7c01-98aa-fd86ff66f9e8" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019cb454-9c22-77b9-bc20-00a99c88d60d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanToValueAxis_019cb454-9c22-79b3-91ce-fc50c079cf72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoanToValueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-74a8-93d4-7e3f3f711c75" xlink:to="loc_us-gaap_LoanToValueAxis_019cb454-9c22-79b3-91ce-fc50c079cf72" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanToValueDomain_019cb454-9c22-79b3-91ce-fc50c079cf72_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoanToValueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LoanToValueAxis_019cb454-9c22-79b3-91ce-fc50c079cf72" xlink:to="loc_us-gaap_LoanToValueDomain_019cb454-9c22-79b3-91ce-fc50c079cf72_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoanToValueDomain_019cb454-9c22-7372-8a4a-50984c7307b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoanToValueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LoanToValueAxis_019cb454-9c22-79b3-91ce-fc50c079cf72" xlink:to="loc_us-gaap_LoanToValueDomain_019cb454-9c22-7372-8a4a-50984c7307b1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_LTVLessThan50PercentMember_019cb454-9c22-7cd0-8fc3-825bb3164465" xlink:href="fg-20260331.xsd#fg_LTVLessThan50PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanToValueDomain_019cb454-9c22-7372-8a4a-50984c7307b1" xlink:to="loc_fg_LTVLessThan50PercentMember_019cb454-9c22-7cd0-8fc3-825bb3164465" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_LTV50To5999PercentMember_019cb454-9c22-7458-8982-42b10fd15cab" xlink:href="fg-20260331.xsd#fg_LTV50To5999PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanToValueDomain_019cb454-9c22-7372-8a4a-50984c7307b1" xlink:to="loc_fg_LTV50To5999PercentMember_019cb454-9c22-7458-8982-42b10fd15cab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_LTV60To7499PercentMember_019cb454-9c22-78e7-a724-e1c68c0017d8" xlink:href="fg-20260331.xsd#fg_LTV60To7499PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanToValueDomain_019cb454-9c22-7372-8a4a-50984c7307b1" xlink:to="loc_fg_LTV60To7499PercentMember_019cb454-9c22-78e7-a724-e1c68c0017d8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_LTV75To8499PercentMember_019cb454-9c22-791c-8b63-0c63295fa824" xlink:href="fg-20260331.xsd#fg_LTV75To8499PercentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LoanToValueDomain_019cb454-9c22-7372-8a4a-50984c7307b1" xlink:to="loc_fg_LTV75To8499PercentMember_019cb454-9c22-791c-8b63-0c63295fa824" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_019cb454-9c22-7623-bc3d-c4d2556e4bab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-74a8-93d4-7e3f3f711c75" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_019cb454-9c22-7623-bc3d-c4d2556e4bab" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cb454-9c22-7623-bc3d-c4d2556e4bab_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019cb454-9c22-7623-bc3d-c4d2556e4bab" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cb454-9c22-7623-bc3d-c4d2556e4bab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019cb454-9c22-7bab-b203-2380973a1d45" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_019cb454-9c22-7623-bc3d-c4d2556e4bab" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019cb454-9c22-7bab-b203-2380973a1d45" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cb454-9c22-7786-8605-a5544f9873e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_019cb454-9c22-7bab-b203-2380973a1d45" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cb454-9c22-7786-8605-a5544f9873e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019cb454-9c22-712f-abed-df4bf926abe3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_019cb454-9c22-7786-8605-a5544f9873e9" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_019cb454-9c22-712f-abed-df4bf926abe3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess_019cb454-9c22-7047-9040-2f589c75a2f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7fa7-a34d-54178a2f64a8" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess_019cb454-9c22-7047-9040-2f589c75a2f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent_019cb454-9c22-70bc-8c90-40186489d3f6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7fa7-a34d-54178a2f64a8" xlink:to="loc_srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent_019cb454-9c22-70bc-8c90-40186489d3f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_019cb454-9c22-7501-8aca-1fde1df6bf36" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7fa7-a34d-54178a2f64a8" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_019cb454-9c22-7501-8aca-1fde1df6bf36" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-7cca-840f-0d2e31e1947c" xlink:href="fg-20260331.xsd#fg_CreditQualityIndicatorCurrentYearAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_019cb454-9c22-7501-8aca-1fde1df6bf36" xlink:to="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-7cca-840f-0d2e31e1947c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_019cb454-9c22-7181-b953-307dc0466d45" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-7cca-840f-0d2e31e1947c" xlink:to="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_019cb454-9c22-7181-b953-307dc0466d45" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_019cb454-9c22-7d8f-ae3a-a2963cdacf6c" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-7cca-840f-0d2e31e1947c" xlink:to="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_019cb454-9c22-7d8f-ae3a-a2963cdacf6c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_019cb454-9c22-761e-b00a-d7d600f5ebed" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-7cca-840f-0d2e31e1947c" xlink:to="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_019cb454-9c22-761e-b00a-d7d600f5ebed" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_019cb454-9c22-702b-b51d-7499efee4033" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-7cca-840f-0d2e31e1947c" xlink:to="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_019cb454-9c22-702b-b51d-7499efee4033" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_019cb454-9c22-7ac9-8c30-708cf53d103f" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-7cca-840f-0d2e31e1947c" xlink:to="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_019cb454-9c22-7ac9-8c30-708cf53d103f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_019cb454-9c22-700b-9af6-d9705176cf81" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-7cca-840f-0d2e31e1947c" xlink:to="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_019cb454-9c22-700b-9af6-d9705176cf81" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess_019cb454-9c22-7a52-afa6-2b025c33d7da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_CreditQualityIndicatorPriorYearAbstract_019cb454-9c22-7ba9-a704-06ad59e92593" xlink:href="fg-20260331.xsd#fg_CreditQualityIndicatorPriorYearAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossByOriginationYearAbstract_019cb454-9c22-7501-8aca-1fde1df6bf36" xlink:to="loc_fg_CreditQualityIndicatorPriorYearAbstract_019cb454-9c22-7ba9-a704-06ad59e92593" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_019cb454-9c22-79ff-9517-87c44f54e757" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_019cb454-9c22-737e-a5d7-658e50af0d20" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_019cb454-9c22-7a7a-a106-2632fd1bc32f" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_019cb454-9c22-70b8-8453-4269dfc3631e" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_019cb454-9c22-7962-84cf-5d890d839fdc" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_019cb454-9c22-7b73-b72a-b4cc37a055d3" xlink:href="fg-20260331.xsd#fg_FinancingReceivableExcludingLoansInProcessExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess_019cb454-9c22-76d4-8791-3c6e980bc6f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLossFeeAndLoanInProcess"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/InvestmentsDistributionofResidentialMortgageLoansbyStateDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#InvestmentsDistributionofResidentialMortgageLoansbyStateDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/InvestmentsDistributionofResidentialMortgageLoansbyStateDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-763e-bdfb-94cb64cf6ece" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-75b7-a771-9a268d91d692" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-763e-bdfb-94cb64cf6ece" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-75b7-a771-9a268d91d692" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_019cb454-9c22-7833-8894-ec9b241660d9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-75b7-a771-9a268d91d692" xlink:to="loc_srt_StatementGeographicalAxis_019cb454-9c22-7833-8894-ec9b241660d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7833-8894-ec9b241660d9_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_019cb454-9c22-7833-8894-ec9b241660d9" xlink:to="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7833-8894-ec9b241660d9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7d65-b2a5-57ea4e6bf359" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_019cb454-9c22-7833-8894-ec9b241660d9" xlink:to="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7d65-b2a5-57ea4e6bf359" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_CA_019cb454-9c22-7685-84ac-bb7f469756fc" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_CA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7d65-b2a5-57ea4e6bf359" xlink:to="loc_stpr_CA_019cb454-9c22-7685-84ac-bb7f469756fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_FL_019cb454-9c22-7bef-8dbd-3c91a26b7aef" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_FL"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7d65-b2a5-57ea4e6bf359" xlink:to="loc_stpr_FL_019cb454-9c22-7bef-8dbd-3c91a26b7aef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_NY_019cb454-9c22-7181-bf26-c27ff7b8c03a" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_NY"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7d65-b2a5-57ea4e6bf359" xlink:to="loc_stpr_NY_019cb454-9c22-7181-bf26-c27ff7b8c03a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_AllOtherStatesMember_019cb454-9c22-7439-85f2-576f66d24261" xlink:href="fg-20260331.xsd#fg_AllOtherStatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_019cb454-9c22-7d65-b2a5-57ea4e6bf359" xlink:to="loc_fg_AllOtherStatesMember_019cb454-9c22-7439-85f2-576f66d24261" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7b2a-baba-c912e27935a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-75b7-a771-9a268d91d692" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7b2a-baba-c912e27935a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7b2a-baba-c912e27935a0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7b2a-baba-c912e27935a0" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7b2a-baba-c912e27935a0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7bf8-a4a4-25a966f46691" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7b2a-baba-c912e27935a0" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7bf8-a4a4-25a966f46691" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_019cb454-9c22-7594-adb2-b43d1d2a67a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7bf8-a4a4-25a966f46691" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_019cb454-9c22-7594-adb2-b43d1d2a67a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019cb454-9c22-7ae6-aec3-b2f85c4e7016" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-763e-bdfb-94cb64cf6ece" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019cb454-9c22-7ae6-aec3-b2f85c4e7016" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019cb454-9c22-793b-a682-40bb112f1eee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-763e-bdfb-94cb64cf6ece" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019cb454-9c22-793b-a682-40bb112f1eee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019cb454-9c22-716a-8f9f-57af4e884d52" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-763e-bdfb-94cb64cf6ece" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019cb454-9c22-716a-8f9f-57af4e884d52" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent_019cb454-9c22-73d0-b904-140181d10cc0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-763e-bdfb-94cb64cf6ece" xlink:to="loc_srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent_019cb454-9c22-73d0-b904-140181d10cc0" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/InvestmentsScheduleofResidentialMortgageLoanswithCreditQualityIndicatorsPerformingorNonperformingDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#InvestmentsScheduleofResidentialMortgageLoanswithCreditQualityIndicatorsPerformingorNonperformingDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/InvestmentsScheduleofResidentialMortgageLoanswithCreditQualityIndicatorsPerformingorNonperformingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-71aa-ae8e-d4813585525d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-7b04-9749-53efcd66cfb2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-71aa-ae8e-d4813585525d" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-7b04-9749-53efcd66cfb2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7994-a68f-09fcc098d25c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-7b04-9749-53efcd66cfb2" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7994-a68f-09fcc098d25c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7994-a68f-09fcc098d25c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7994-a68f-09fcc098d25c" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7994-a68f-09fcc098d25c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-79b1-adcb-ab02af5724c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7994-a68f-09fcc098d25c" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-79b1-adcb-ab02af5724c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_019cb454-9c22-7cdb-a5d0-56465a312f54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-79b1-adcb-ab02af5724c3" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_019cb454-9c22-7cdb-a5d0-56465a312f54" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_019cb454-9c22-7161-a4e0-4d4f5294c17c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentPerformanceStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-7b04-9749-53efcd66cfb2" xlink:to="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_019cb454-9c22-7161-a4e0-4d4f5294c17c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_019cb454-9c22-7161-a4e0-4d4f5294c17c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentPerformanceStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_019cb454-9c22-7161-a4e0-4d4f5294c17c" xlink:to="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_019cb454-9c22-7161-a4e0-4d4f5294c17c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_019cb454-9c22-75f5-a96a-4292f67f56fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentPerformanceStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusAxis_019cb454-9c22-7161-a4e0-4d4f5294c17c" xlink:to="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_019cb454-9c22-75f5-a96a-4292f67f56fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformingFinancingReceivableMember_019cb454-9c22-73bb-a8e6-36baf313b2f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PerformingFinancingReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_019cb454-9c22-75f5-a96a-4292f67f56fa" xlink:to="loc_us-gaap_PerformingFinancingReceivableMember_019cb454-9c22-73bb-a8e6-36baf313b2f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonperformingFinancingReceivableMember_019cb454-9c22-7421-9bbe-249eb561a827" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NonperformingFinancingReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentPerformanceStatusDomain_019cb454-9c22-75f5-a96a-4292f67f56fa" xlink:to="loc_us-gaap_NonperformingFinancingReceivableMember_019cb454-9c22-7421-9bbe-249eb561a827" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019cb454-9c22-7aea-b2c2-47969d59f365" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-71aa-ae8e-d4813585525d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019cb454-9c22-7aea-b2c2-47969d59f365" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent_019cb454-9c22-7c68-aac9-0eb46a941e5c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-71aa-ae8e-d4813585525d" xlink:to="loc_srt_FinancingReceivableBeforeAllowanceForCreditLossToTotalPercent_019cb454-9c22-7c68-aac9-0eb46a941e5c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019cb454-9c22-7b98-ad16-70d2fa1c4cc9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-71aa-ae8e-d4813585525d" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019cb454-9c22-7b98-ad16-70d2fa1c4cc9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019cb454-9c22-7c4a-a9a4-37373772db93" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-71aa-ae8e-d4813585525d" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_019cb454-9c22-7c4a-a9a4-37373772db93" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/InvestmentsScheduleofResidentialLoansSegregatedbyRiskRatingExposureandNonaccrualLoansbyAmortizedCostDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#InvestmentsScheduleofResidentialLoansSegregatedbyRiskRatingExposureandNonaccrualLoansbyAmortizedCostDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/InvestmentsScheduleofResidentialLoansSegregatedbyRiskRatingExposureandNonaccrualLoansbyAmortizedCostDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-77e1-9f93-ba23fe686497" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-72d3-8ef7-61cf392fd466" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-77e1-9f93-ba23fe686497" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-72d3-8ef7-61cf392fd466" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019cb454-9c22-7645-8f6b-1e6f53613156" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-72d3-8ef7-61cf392fd466" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019cb454-9c22-7645-8f6b-1e6f53613156" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cb454-9c22-7645-8f6b-1e6f53613156_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019cb454-9c22-7645-8f6b-1e6f53613156" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cb454-9c22-7645-8f6b-1e6f53613156_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cb454-9c22-72f9-8c5c-3cf99b10a3b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_019cb454-9c22-7645-8f6b-1e6f53613156" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cb454-9c22-72f9-8c5c-3cf99b10a3b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables1To29DaysPastDueMember_019cb454-9c22-7241-b969-09e121f0e617" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivables1To29DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cb454-9c22-72f9-8c5c-3cf99b10a3b4" xlink:to="loc_us-gaap_FinancingReceivables1To29DaysPastDueMember_019cb454-9c22-7241-b969-09e121f0e617" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FinancialAsset30To89DaysPastDueMember_019cb454-9c22-7278-8813-69eb681d344c" xlink:href="fg-20260331.xsd#fg_FinancialAsset30To89DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cb454-9c22-72f9-8c5c-3cf99b10a3b4" xlink:to="loc_fg_FinancialAsset30To89DaysPastDueMember_019cb454-9c22-7278-8813-69eb681d344c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_019cb454-9c22-7285-8f6c-6f24d1d753e0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_019cb454-9c22-72f9-8c5c-3cf99b10a3b4" xlink:to="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_019cb454-9c22-7285-8f6c-6f24d1d753e0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7602-acbc-91b5a2e9f9d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-72d3-8ef7-61cf392fd466" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7602-acbc-91b5a2e9f9d5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7602-acbc-91b5a2e9f9d5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7602-acbc-91b5a2e9f9d5" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7602-acbc-91b5a2e9f9d5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-72c6-a75c-6f67e41daf14" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-7602-acbc-91b5a2e9f9d5" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-72c6-a75c-6f67e41daf14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_019cb454-9c22-70cc-a9dc-56717eb6f98b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-72c6-a75c-6f67e41daf14" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_019cb454-9c22-70cc-a9dc-56717eb6f98b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019cb454-9c22-75e2-bb8d-80535fc9ad28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-72c6-a75c-6f67e41daf14" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019cb454-9c22-75e2-bb8d-80535fc9ad28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-772d-aea4-422cc5d9cef0" xlink:href="fg-20260331.xsd#fg_CreditQualityIndicatorCurrentYearAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-77e1-9f93-ba23fe686497" xlink:to="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-772d-aea4-422cc5d9cef0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_019cb454-9c22-7397-ae16-d7bc43da157b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-772d-aea4-422cc5d9cef0" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_019cb454-9c22-7397-ae16-d7bc43da157b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_019cb454-9c22-7e40-8fd8-54c8b22a8fe0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-772d-aea4-422cc5d9cef0" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_019cb454-9c22-7e40-8fd8-54c8b22a8fe0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_019cb454-9c22-7cb2-8391-dcab5be63fdb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-772d-aea4-422cc5d9cef0" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_019cb454-9c22-7cb2-8391-dcab5be63fdb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_019cb454-9c22-783e-a8fd-c63eba35f7d3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-772d-aea4-422cc5d9cef0" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_019cb454-9c22-783e-a8fd-c63eba35f7d3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_019cb454-9c22-7e10-94fa-1a9f5e17de8f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-772d-aea4-422cc5d9cef0" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_019cb454-9c22-7e10-94fa-1a9f5e17de8f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_019cb454-9c22-796f-b42b-26b217f9f04a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-772d-aea4-422cc5d9cef0" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_019cb454-9c22-796f-b42b-26b217f9f04a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019cb454-9c22-792d-b2e5-26c228a70145" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_CreditQualityIndicatorCurrentYearAbstract_019cb454-9c22-772d-aea4-422cc5d9cef0" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019cb454-9c22-792d-b2e5-26c228a70145" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_CreditQualityIndicatorPriorYearAbstract_019cb454-9c22-7a12-91dc-9d508628bcfa" xlink:href="fg-20260331.xsd#fg_CreditQualityIndicatorPriorYearAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-77e1-9f93-ba23fe686497" xlink:to="loc_fg_CreditQualityIndicatorPriorYearAbstract_019cb454-9c22-7a12-91dc-9d508628bcfa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_019cb454-9c22-79f9-a644-4316fe8ad435" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_019cb454-9c22-7a99-8ea1-5e41a3bc41b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_019cb454-9c22-7f62-9a9c-ef6bac506c48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_019cb454-9c22-733d-8262-e033bfa5249a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_019cb454-9c22-71bb-b4d5-ca56232e9c57" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_019cb454-9c22-7979-ba59-2b43179784dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_019cb454-9c22-7a06-b018-a019a0705ee6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_AmortizedCostOfNonAccrualLoansAbstract_019cb454-9c22-761e-9b21-ea9ac3dd7d13" xlink:href="fg-20260331.xsd#fg_AmortizedCostOfNonAccrualLoansAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-77e1-9f93-ba23fe686497" xlink:to="loc_fg_AmortizedCostOfNonAccrualLoansAbstract_019cb454-9c22-761e-9b21-ea9ac3dd7d13" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual_019cb454-9c22-7946-ac21-34a30bccb122" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_AmortizedCostOfNonAccrualLoansAbstract_019cb454-9c22-761e-9b21-ea9ac3dd7d13" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual_019cb454-9c22-7946-ac21-34a30bccb122" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/InvestmentsChangesinAllowanceforExpectedCreditLossesonMortgageLoansDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#InvestmentsChangesinAllowanceforExpectedCreditLossesonMortgageLoansDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/InvestmentsChangesinAllowanceforExpectedCreditLossesonMortgageLoansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_019cb454-9c22-745a-a6db-a07bd9c563d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_019cb454-9c22-74dc-9c93-86f5f15e456a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_019cb454-9c22-745a-a6db-a07bd9c563d6" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_019cb454-9c22-74dc-9c93-86f5f15e456a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-78c0-bdd2-b9746bf6d946" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_019cb454-9c22-74dc-9c93-86f5f15e456a" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-78c0-bdd2-b9746bf6d946" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-78c0-bdd2-b9746bf6d946_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-78c0-bdd2-b9746bf6d946" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-78c0-bdd2-b9746bf6d946_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7684-8b29-e3adaebfc515" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_019cb454-9c22-78c0-bdd2-b9746bf6d946" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7684-8b29-e3adaebfc515" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResidentialPortfolioSegmentMember_019cb454-9c22-70db-9b25-9bb09290b00d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ResidentialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7684-8b29-e3adaebfc515" xlink:to="loc_us-gaap_ResidentialPortfolioSegmentMember_019cb454-9c22-70db-9b25-9bb09290b00d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_019cb454-9c22-7be7-afd8-7ed94509793b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_019cb454-9c22-7684-8b29-e3adaebfc515" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_019cb454-9c22-7be7-afd8-7ed94509793b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_019cb454-9c22-7427-ae09-6906238cd29b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_019cb454-9c22-745a-a6db-a07bd9c563d6" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_019cb454-9c22-7427-ae09-6906238cd29b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019cb454-9c22-7a6b-9533-f964ec0e668b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_019cb454-9c22-7427-ae09-6906238cd29b" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019cb454-9c22-7a6b-9533-f964ec0e668b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal_019cb454-9c22-7d7d-bf9f-80604873422f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesRollForward_019cb454-9c22-7427-ae09-6906238cd29b" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversal_019cb454-9c22-7d7d-bf9f-80604873422f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_019cb454-9c22-782d-8e02-8228a4589bde" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/InvestmentsScheduleofSourcesofNetInvestmentIncomeReportedDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#InvestmentsScheduleofSourcesofNetInvestmentIncomeReportedDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/InvestmentsScheduleofSourcesofNetInvestmentIncomeReportedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7e98-a04e-ff62293a49eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-7869-a6bb-c50640dddef9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7e98-a04e-ff62293a49eb" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-7869-a6bb-c50640dddef9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019cb454-9c22-797d-a146-7913b927d82b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-7869-a6bb-c50640dddef9" xlink:to="loc_us-gaap_InvestmentTypeAxis_019cb454-9c22-797d-a146-7913b927d82b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-797d-a146-7913b927d82b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019cb454-9c22-797d-a146-7913b927d82b" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-797d-a146-7913b927d82b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-7550-97b0-34208b451f29" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019cb454-9c22-797d-a146-7913b927d82b" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-7550-97b0-34208b451f29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesMember_019cb454-9c22-7a86-a699-49c76934c1c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-7550-97b0-34208b451f29" xlink:to="loc_us-gaap_DebtSecuritiesMember_019cb454-9c22-7a86-a699-49c76934c1c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_019cb454-9c22-78f4-bd42-87d60a534754" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-7550-97b0-34208b451f29" xlink:to="loc_us-gaap_PreferredStockMember_019cb454-9c22-78f4-bd42-87d60a534754" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019cb454-9c22-7346-8f52-1cdb03ec10da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-7550-97b0-34208b451f29" xlink:to="loc_us-gaap_CommonStockMember_019cb454-9c22-7346-8f52-1cdb03ec10da" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MortgageLoansMember_019cb454-9c22-7191-b98b-d8beadbea6fe" xlink:href="fg-20260331.xsd#fg_MortgageLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-7550-97b0-34208b451f29" xlink:to="loc_fg_MortgageLoansMember_019cb454-9c22-7191-b98b-d8beadbea6fe" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_InvestedCashAndShortTermInvestmentsMember_019cb454-9c22-7394-9467-465d144b109c" xlink:href="fg-20260331.xsd#fg_InvestedCashAndShortTermInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-7550-97b0-34208b451f29" xlink:to="loc_fg_InvestedCashAndShortTermInvestmentsMember_019cb454-9c22-7394-9467-465d144b109c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_LimitedPartnershipMember_019cb454-9c22-7516-a1a1-17ff31441fe5" xlink:href="fg-20260331.xsd#fg_LimitedPartnershipMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-7550-97b0-34208b451f29" xlink:to="loc_fg_LimitedPartnershipMember_019cb454-9c22-7516-a1a1-17ff31441fe5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestmentsMember_019cb454-9c22-76a0-b9c9-52db9adfa98b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-7550-97b0-34208b451f29" xlink:to="loc_us-gaap_OtherInvestmentsMember_019cb454-9c22-76a0-b9c9-52db9adfa98b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossInvestmentIncomeOperating_019cb454-9c22-7bc5-9125-ae54aca9bb3b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GrossInvestmentIncomeOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7e98-a04e-ff62293a49eb" xlink:to="loc_us-gaap_GrossInvestmentIncomeOperating_019cb454-9c22-7bc5-9125-ae54aca9bb3b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInvestmentExpense_019cb454-9c22-7c56-947f-0cf1a21dc7ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentIncomeInvestmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7e98-a04e-ff62293a49eb" xlink:to="loc_us-gaap_InvestmentIncomeInvestmentExpense_019cb454-9c22-7c56-947f-0cf1a21dc7ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentIncome_019cb454-9c22-7f5b-a6b7-2ff9aab3d1b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetInvestmentIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7e98-a04e-ff62293a49eb" xlink:to="loc_us-gaap_NetInvestmentIncome_019cb454-9c22-7f5b-a6b7-2ff9aab3d1b5" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/InvestmentsRecognizedGainsLossNetDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#InvestmentsRecognizedGainsLossNetDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/InvestmentsRecognizedGainsLossNetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7b76-9998-137a30b5f6d0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-76d8-9729-8e38cf0e5b39" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7b76-9998-137a30b5f6d0" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-76d8-9729-8e38cf0e5b39" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019cb454-9c22-7c43-a9b7-797c52232667" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-76d8-9729-8e38cf0e5b39" xlink:to="loc_us-gaap_InvestmentTypeAxis_019cb454-9c22-7c43-a9b7-797c52232667" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-7c43-a9b7-797c52232667_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019cb454-9c22-7c43-a9b7-797c52232667" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-7c43-a9b7-797c52232667_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-7b09-87b7-86662abdd4e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019cb454-9c22-7c43-a9b7-797c52232667" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-7b09-87b7-86662abdd4e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockMember_019cb454-9c22-771a-96b5-219c33594bd3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-7b09-87b7-86662abdd4e9" xlink:to="loc_us-gaap_PreferredStockMember_019cb454-9c22-771a-96b5-219c33594bd3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019cb454-9c22-7f39-a0f4-a4188d1af7ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-7b09-87b7-86662abdd4e9" xlink:to="loc_us-gaap_CommonStockMember_019cb454-9c22-7f39-a0f4-a4188d1af7ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019d450c-d62b-7b25-b97e-afc3bcd33d21" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-76d8-9729-8e38cf0e5b39" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019d450c-d62b-7b25-b97e-afc3bcd33d21" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019d450c-d62b-7b25-b97e-afc3bcd33d21_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019d450c-d62b-7b25-b97e-afc3bcd33d21" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019d450c-d62b-7b25-b97e-afc3bcd33d21_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019d450c-d62b-7f7e-9de2-6beca9acc7a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019d450c-d62b-7b25-b97e-afc3bcd33d21" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019d450c-d62b-7f7e-9de2-6beca9acc7a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_EmbeddedDerivativesInReinsuranceContractsMember_019d450c-d62b-7500-9773-31986b6c50c3" xlink:href="fg-20260331.xsd#fg_EmbeddedDerivativesInReinsuranceContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019d450c-d62b-7f7e-9de2-6beca9acc7a5" xlink:to="loc_fg_EmbeddedDerivativesInReinsuranceContractsMember_019d450c-d62b-7500-9773-31986b6c50c3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019d450c-d62b-728d-bd6c-63a4e1042042" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-76d8-9729-8e38cf0e5b39" xlink:to="loc_us-gaap_HedgingDesignationAxis_019d450c-d62b-728d-bd6c-63a4e1042042" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019d450c-d62b-728d-bd6c-63a4e1042042_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019d450c-d62b-728d-bd6c-63a4e1042042" xlink:to="loc_us-gaap_HedgingDesignationDomain_019d450c-d62b-728d-bd6c-63a4e1042042_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019d450c-d62b-788d-a677-252a3692b672" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019d450c-d62b-728d-bd6c-63a4e1042042" xlink:to="loc_us-gaap_HedgingDesignationDomain_019d450c-d62b-788d-a677-252a3692b672" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019d450c-d62b-7a54-906f-952cebb21c62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019d450c-d62b-788d-a677-252a3692b672" xlink:to="loc_us-gaap_NondesignatedMember_019d450c-d62b-7a54-906f-952cebb21c62" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019df847-fe81-71c5-868d-8596604d781e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-76d8-9729-8e38cf0e5b39" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019df847-fe81-71c5-868d-8596604d781e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_019df847-fe81-71c5-868d-8596604d781e_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019df847-fe81-71c5-868d-8596604d781e" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_019df847-fe81-71c5-868d-8596604d781e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_019df847-fe81-75da-96db-d3ba752e7bcc" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019df847-fe81-71c5-868d-8596604d781e" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_019df847-fe81-75da-96db-d3ba752e7bcc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FGLifeReMember_019df848-37aa-75ce-8422-939ab213193c" xlink:href="fg-20260331.xsd#fg_FGLifeReMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_019df847-fe81-75da-96db-d3ba752e7bcc" xlink:to="loc_fg_FGLifeReMember_019df848-37aa-75ce-8422-939ab213193c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesRealizedGainLoss_019cb454-9c22-79a7-a698-17096a2a1afa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesRealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7b76-9998-137a30b5f6d0" xlink:to="loc_us-gaap_DebtSecuritiesRealizedGainLoss_019cb454-9c22-79a7-a698-17096a2a1afa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiRealizedGainLoss_019cb454-9c22-7461-af02-0e23fae84957" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNiRealizedGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7b76-9998-137a30b5f6d0" xlink:to="loc_us-gaap_EquitySecuritiesFvNiRealizedGainLoss_019cb454-9c22-7461-af02-0e23fae84957" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfOtherInvestments_019cb454-9c22-795b-91c1-1abecc649aa7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnSaleOfOtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7b76-9998-137a30b5f6d0" xlink:to="loc_us-gaap_GainLossOnSaleOfOtherInvestments_019cb454-9c22-795b-91c1-1abecc649aa7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesFvNiGainLoss_019dcea7-a398-77f3-800c-e501e2e9922f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesFvNiGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7b76-9998-137a30b5f6d0" xlink:to="loc_us-gaap_EquitySecuritiesFvNiGainLoss_019dcea7-a398-77f3-800c-e501e2e9922f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossPeriodIncreaseDecrease_019cb454-9c22-7708-849e-fdac2acbaf48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossPeriodIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7b76-9998-137a30b5f6d0" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossPeriodIncreaseDecrease_019cb454-9c22-7708-849e-fdac2acbaf48" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSaleOfDerivatives_019cb454-9c22-7971-9002-7858dfb85402" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnSaleOfDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7b76-9998-137a30b5f6d0" xlink:to="loc_us-gaap_GainLossOnSaleOfDerivatives_019cb454-9c22-7971-9002-7858dfb85402" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrealizedGainLossOnDerivatives_019cb454-9c22-701b-be99-d8c79c1a0ae4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnrealizedGainLossOnDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7b76-9998-137a30b5f6d0" xlink:to="loc_us-gaap_UnrealizedGainLossOnDerivatives_019cb454-9c22-701b-be99-d8c79c1a0ae4" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_019cb454-9c22-727f-b4b1-d04fb889ec58" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeGainLossOnDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7b76-9998-137a30b5f6d0" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_019cb454-9c22-727f-b4b1-d04fb889ec58" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet_019cb454-9c22-7b93-bb80-e15879d1a769" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7b76-9998-137a30b5f6d0" xlink:to="loc_us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet_019cb454-9c22-7b93-bb80-e15879d1a769" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ChangeInFairValueDerivativesIncludingOtherDerivatives_019cb454-9c22-7f19-a389-a0877d18a73c" xlink:href="fg-20260331.xsd#fg_ChangeInFairValueDerivativesIncludingOtherDerivatives"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7b76-9998-137a30b5f6d0" xlink:to="loc_fg_ChangeInFairValueDerivativesIncludingOtherDerivatives_019cb454-9c22-7f19-a389-a0877d18a73c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_019cb454-9c22-79af-90bb-afd228359e5e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7b76-9998-137a30b5f6d0" xlink:to="loc_us-gaap_GainLossOnInvestments_019cb454-9c22-79af-90bb-afd228359e5e" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_EquitySecuritiesFVNIValuationGainLoss_019cb454-9c22-721c-9760-9962cc6b7346" xlink:href="fg-20260331.xsd#fg_EquitySecuritiesFVNIValuationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7b76-9998-137a30b5f6d0" xlink:to="loc_fg_EquitySecuritiesFVNIValuationGainLoss_019cb454-9c22-721c-9760-9962cc6b7346" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/InvestmentsScheduleofVariableInterestEntitiesDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#InvestmentsScheduleofVariableInterestEntitiesDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/InvestmentsScheduleofVariableInterestEntitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019d47a7-d9f4-7cd2-b1a6-d2c195111196" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019d47a7-d9f4-7e58-acbf-f593b850190e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019d47a7-d9f4-7cd2-b1a6-d2c195111196" xlink:to="loc_us-gaap_DebtInstrumentTable_019d47a7-d9f4-7e58-acbf-f593b850190e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019d47a7-d9f4-70d6-9411-2393b86b86ad" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019d47a7-d9f4-7e58-acbf-f593b850190e" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019d47a7-d9f4-70d6-9411-2393b86b86ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019d47a7-d9f4-70d6-9411-2393b86b86ad_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019d47a7-d9f4-70d6-9411-2393b86b86ad" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019d47a7-d9f4-70d6-9411-2393b86b86ad_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019d47a7-d9f4-7410-a8a7-4fa6b5d679d7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019d47a7-d9f4-70d6-9411-2393b86b86ad" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019d47a7-d9f4-7410-a8a7-4fa6b5d679d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019d47a7-d9f4-76ee-8fb8-b81a86075177" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019d47a7-d9f4-7410-a8a7-4fa6b5d679d7" xlink:to="loc_us-gaap_VariableInterestEntityPrimaryBeneficiaryMember_019d47a7-d9f4-76ee-8fb8-b81a86075177" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestments_019d47a7-d9f4-7288-b9a5-61a39be602db" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019d47a7-d9f4-7cd2-b1a6-d2c195111196" xlink:to="loc_us-gaap_EquityMethodInvestments_019d47a7-d9f4-7288-b9a5-61a39be602db" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019df9a0-d499-76f0-a952-899cdb581726" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019d47a7-d9f4-7cd2-b1a6-d2c195111196" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_019df9a0-d499-76f0-a952-899cdb581726" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermInvestments_019dfce5-10a7-7b17-8115-acf2e222001c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLongTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019d47a7-d9f4-7cd2-b1a6-d2c195111196" xlink:to="loc_us-gaap_OtherLongTermInvestments_019dfce5-10a7-7b17-8115-acf2e222001c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestments_019d47a7-d9f4-7121-a7b3-58cc17929f15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019d47a7-d9f4-7cd2-b1a6-d2c195111196" xlink:to="loc_us-gaap_ShortTermInvestments_019d47a7-d9f4-7121-a7b3-58cc17929f15" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019d47a7-d9f4-770e-b9de-8afe52dbfac7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019d47a7-d9f4-7cd2-b1a6-d2c195111196" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_019d47a7-d9f4-770e-b9de-8afe52dbfac7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_019d47a7-d9f4-7a94-8be9-9c450aceac2e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019d47a7-d9f4-7cd2-b1a6-d2c195111196" xlink:to="loc_us-gaap_Assets_019d47a7-d9f4-7a94-8be9-9c450aceac2e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsNet_019d47a7-d9f4-7259-bc0c-4b64c3f61d12" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019d47a7-d9f4-7cd2-b1a6-d2c195111196" xlink:to="loc_us-gaap_AssetsNet_019d47a7-d9f4-7259-bc0c-4b64c3f61d12" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/InvestmentsScheduleofCarryingValueandMaximumLossExposureUnconsolidatedVIEsDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#InvestmentsScheduleofCarryingValueandMaximumLossExposureUnconsolidatedVIEsDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/InvestmentsScheduleofCarryingValueandMaximumLossExposureUnconsolidatedVIEsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7050-9d76-89138296e621" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-73c9-89a7-5c77c909537c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7050-9d76-89138296e621" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-73c9-89a7-5c77c909537c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeAxis_019cb454-9c22-78eb-83dd-da9e4e4b4d50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-73c9-89a7-5c77c909537c" xlink:to="loc_us-gaap_InvestmentTypeAxis_019cb454-9c22-78eb-83dd-da9e4e4b4d50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-78eb-83dd-da9e4e4b4d50_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InvestmentTypeAxis_019cb454-9c22-78eb-83dd-da9e4e4b4d50" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-78eb-83dd-da9e4e4b4d50_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-78e9-8654-b297bad728d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeCategorizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InvestmentTypeAxis_019cb454-9c22-78eb-83dd-da9e4e4b4d50" xlink:to="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-78e9-8654-b297bad728d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentsMember_019cb454-9c22-7c9e-b8f4-596458ba551a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-78e9-8654-b297bad728d8" xlink:to="loc_us-gaap_EquityMethodInvestmentsMember_019cb454-9c22-7c9e-b8f4-596458ba551a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FixedMaturitySecuritiesMember_019cb454-9c22-7fed-8544-49d81631f949" xlink:href="fg-20260331.xsd#fg_FixedMaturitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InvestmentTypeCategorizationMember_019cb454-9c22-78e9-8654-b297bad728d8" xlink:to="loc_fg_FixedMaturitySecuritiesMember_019cb454-9c22-7fed-8544-49d81631f949" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_019d450f-fba4-717c-89ff-570881e8b188" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-73c9-89a7-5c77c909537c" xlink:to="loc_srt_ConsolidatedEntitiesAxis_019d450f-fba4-717c-89ff-570881e8b188" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019d450f-fba4-717c-89ff-570881e8b188_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019d450f-fba4-717c-89ff-570881e8b188" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019d450f-fba4-717c-89ff-570881e8b188_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_019d450f-fba4-7f62-b39d-ea22b0a84ea0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_019d450f-fba4-717c-89ff-570881e8b188" xlink:to="loc_srt_ConsolidatedEntitiesDomain_019d450f-fba4-7f62-b39d-ea22b0a84ea0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember_019d4510-2541-7058-a18f-2885d853168a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_019d450f-fba4-7f62-b39d-ea22b0a84ea0" xlink:to="loc_us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember_019d4510-2541-7058-a18f-2885d853168a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_InvestmentsOwnedVIEUnconsolidatedCarryingValue_019cb454-9c22-7b23-a23f-05d7bfb2b7c5" xlink:href="fg-20260331.xsd#fg_InvestmentsOwnedVIEUnconsolidatedCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7050-9d76-89138296e621" xlink:to="loc_fg_InvestmentsOwnedVIEUnconsolidatedCarryingValue_019cb454-9c22-7b23-a23f-05d7bfb2b7c5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_019cb454-9c22-7fe2-8def-dde07a902e20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7050-9d76-89138296e621" xlink:to="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_019cb454-9c22-7fe2-8def-dde07a902e20" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/InvestmentsSchedulesofInvestmentConcentrationsDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#InvestmentsSchedulesofInvestmentConcentrationsDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/InvestmentsSchedulesofInvestmentConcentrationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7da3-9bf6-3848037487b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-7e01-9815-c75358f42612" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfInvestmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7da3-9bf6-3848037487b9" xlink:to="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-7e01-9815-c75358f42612" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019cb454-9c22-786c-bdfe-02510c437310" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-7e01-9815-c75358f42612" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019cb454-9c22-786c-bdfe-02510c437310" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_019cb454-9c22-786c-bdfe-02510c437310_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019cb454-9c22-786c-bdfe-02510c437310" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_019cb454-9c22-786c-bdfe-02510c437310_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_019cb454-9c22-746c-9d53-ad2c86b5c54d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_019cb454-9c22-786c-bdfe-02510c437310" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_019cb454-9c22-746c-9d53-ad2c86b5c54d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_BlackstoneWaveMember_019cb454-9c22-720b-9c14-4bb2d3640847" xlink:href="fg-20260331.xsd#fg_BlackstoneWaveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_019cb454-9c22-746c-9d53-ad2c86b5c54d" xlink:to="loc_fg_BlackstoneWaveMember_019cb454-9c22-720b-9c14-4bb2d3640847" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cb454-9c22-72c2-a16e-f322277f441f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-7e01-9815-c75358f42612" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cb454-9c22-72c2-a16e-f322277f441f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cb454-9c22-72c2-a16e-f322277f441f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cb454-9c22-72c2-a16e-f322277f441f" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cb454-9c22-72c2-a16e-f322277f441f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cb454-9c22-7a4b-80da-dafb7bf2c0c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_019cb454-9c22-72c2-a16e-f322277f441f" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cb454-9c22-7a4b-80da-dafb7bf2c0c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityTotalMember_019cb454-9c22-733f-b7a3-f3902f5883f6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquityTotalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_019cb454-9c22-7a4b-80da-dafb7bf2c0c0" xlink:to="loc_us-gaap_StockholdersEquityTotalMember_019cb454-9c22-733f-b7a3-f3902f5883f6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_019cb454-9c22-7fff-be45-65b7863e77b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfInvestmentsTable_019cb454-9c22-7e01-9815-c75358f42612" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_019cb454-9c22-7fff-be45-65b7863e77b0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019cb454-9c22-7fff-be45-65b7863e77b0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019cb454-9c22-7fff-be45-65b7863e77b0" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019cb454-9c22-7fff-be45-65b7863e77b0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_019cb454-9c22-7554-9f68-1980d4bacf3c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_019cb454-9c22-7fff-be45-65b7863e77b0" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_019cb454-9c22-7554-9f68-1980d4bacf3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_InvestmentRiskConcentrationMember_019cb454-9c22-7d5e-9636-89bea74783eb" xlink:href="fg-20260331.xsd#fg_InvestmentRiskConcentrationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_019cb454-9c22-7554-9f68-1980d4bacf3c" xlink:to="loc_fg_InvestmentRiskConcentrationMember_019cb454-9c22-7d5e-9636-89bea74783eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentOwnedAtFairValue_019cb454-9c22-7232-9258-f090d40b6c2e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentOwnedAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfInvestmentsLineItems_019cb454-9c22-7da3-9bf6-3848037487b9" xlink:to="loc_us-gaap_InvestmentOwnedAtFairValue_019cb454-9c22-7232-9258-f090d40b6c2e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/DerivativeFinancialInstrumentsCarryingAmountsofDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#DerivativeFinancialInstrumentsCarryingAmountsofDerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/DerivativeFinancialInstrumentsCarryingAmountsofDerivativeInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019cb454-9c22-7b7c-8a3a-b09523a642b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019cb454-9c22-7ca0-baa6-b4fd3821fb09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019cb454-9c22-7b7c-8a3a-b09523a642b6" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019cb454-9c22-7ca0-baa6-b4fd3821fb09" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019cb454-9c22-717d-b766-549f624cbbfd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019cb454-9c22-7ca0-baa6-b4fd3821fb09" xlink:to="loc_us-gaap_HedgingDesignationAxis_019cb454-9c22-717d-b766-549f624cbbfd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019cb454-9c22-717d-b766-549f624cbbfd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019cb454-9c22-717d-b766-549f624cbbfd" xlink:to="loc_us-gaap_HedgingDesignationDomain_019cb454-9c22-717d-b766-549f624cbbfd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019cb454-9c22-78ae-bd9d-5ec2090d4b9e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019cb454-9c22-717d-b766-549f624cbbfd" xlink:to="loc_us-gaap_HedgingDesignationDomain_019cb454-9c22-78ae-bd9d-5ec2090d4b9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019cb454-9c22-7981-80ac-9c65e41d1fc6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019cb454-9c22-78ae-bd9d-5ec2090d4b9e" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019cb454-9c22-7981-80ac-9c65e41d1fc6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019cb454-9c22-7cba-aa7e-9854380aa8ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019cb454-9c22-78ae-bd9d-5ec2090d4b9e" xlink:to="loc_us-gaap_NondesignatedMember_019cb454-9c22-7cba-aa7e-9854380aa8ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9c22-7933-828a-047061396441" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_019cb454-9c22-7ca0-baa6-b4fd3821fb09" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9c22-7933-828a-047061396441" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-7933-828a-047061396441_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9c22-7933-828a-047061396441" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-7933-828a-047061396441_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-711f-a1a4-d62144025bd8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9c22-7933-828a-047061396441" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-711f-a1a4-d62144025bd8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019cb454-9c22-7d48-b581-106e665f5d4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-711f-a1a4-d62144025bd8" xlink:to="loc_us-gaap_InterestRateSwapMember_019cb454-9c22-7d48-b581-106e665f5d4e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ForeignCurrencySwapsMember_019cb454-9c22-7293-a751-24812179b009" xlink:href="fg-20260331.xsd#fg_ForeignCurrencySwapsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-711f-a1a4-d62144025bd8" xlink:to="loc_fg_ForeignCurrencySwapsMember_019cb454-9c22-7293-a751-24812179b009" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockOptionMember_019cb454-9c22-7809-a70d-e67abe015dd2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-711f-a1a4-d62144025bd8" xlink:to="loc_us-gaap_StockOptionMember_019cb454-9c22-7809-a70d-e67abe015dd2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FutureMember_019cb454-9c22-74c9-a40e-387ab0c23403" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FutureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-711f-a1a4-d62144025bd8" xlink:to="loc_us-gaap_FutureMember_019cb454-9c22-74c9-a40e-387ab0c23403" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_OtherDerivativeInvestmentsMember_019cb454-9c22-7c7f-b7b4-7b779db26fc0" xlink:href="fg-20260331.xsd#fg_OtherDerivativeInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-711f-a1a4-d62144025bd8" xlink:to="loc_fg_OtherDerivativeInvestmentsMember_019cb454-9c22-7c7f-b7b4-7b779db26fc0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019cb454-9c22-7d61-8201-a65503ffb0a8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmbeddedDerivativeFinancialInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-711f-a1a4-d62144025bd8" xlink:to="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019cb454-9c22-7d61-8201-a65503ffb0a8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember_019cb454-9c22-788b-94a4-ec3ab0615cd1" xlink:href="fg-20260331.xsd#fg_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-711f-a1a4-d62144025bd8" xlink:to="loc_fg_IndexedAnnuityIULEmbeddedDerivativesLiabilitiesInContractHolderFundsMember_019cb454-9c22-788b-94a4-ec3ab0615cd1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_EmbeddedDerivativesInReinsuranceContractsMember_019cb454-9c22-70f4-9c01-fe920a51d10f" xlink:href="fg-20260331.xsd#fg_EmbeddedDerivativesInReinsuranceContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-711f-a1a4-d62144025bd8" xlink:to="loc_fg_EmbeddedDerivativesInReinsuranceContractsMember_019cb454-9c22-70f4-9c01-fe920a51d10f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_019cb454-9c22-79fe-8e6e-250022af70e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019cb454-9c22-7b7c-8a3a-b09523a642b6" xlink:to="loc_us-gaap_DerivativeNotionalAmount_019cb454-9c22-79fe-8e6e-250022af70e2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019cb454-9c22-79bc-b277-a6b7f4530724" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019cb454-9c22-7b7c-8a3a-b09523a642b6" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019cb454-9c22-79bc-b277-a6b7f4530724" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019cb454-9c22-78de-8d07-8aad079f89fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_019cb454-9c22-7b7c-8a3a-b09523a642b6" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_019cb454-9c22-78de-8d07-8aad079f89fa" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/DerivativeFinancialInstrumentsScheduleofChangeinFairValueofDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#DerivativeFinancialInstrumentsScheduleofChangeinFairValueofDerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/DerivativeFinancialInstrumentsScheduleofChangeinFairValueofDerivativeInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019cb454-9c22-7a1a-9ebf-3d18318945a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_019cb454-9c22-7a3b-b579-85acab6e1a89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019cb454-9c22-7a1a-9ebf-3d18318945a5" xlink:to="loc_us-gaap_DerivativeTable_019cb454-9c22-7a3b-b579-85acab6e1a89" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9c22-7bb0-b10a-60ba0b4262d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019cb454-9c22-7a3b-b579-85acab6e1a89" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9c22-7bb0-b10a-60ba0b4262d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-7bb0-b10a-60ba0b4262d5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9c22-7bb0-b10a-60ba0b4262d5" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-7bb0-b10a-60ba0b4262d5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-79c8-895f-c605923919a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9c22-7bb0-b10a-60ba0b4262d5" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-79c8-895f-c605923919a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_019cb454-9c22-79dd-9ed0-60556df82a87" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-79c8-895f-c605923919a2" xlink:to="loc_us-gaap_InterestRateSwapMember_019cb454-9c22-79dd-9ed0-60556df82a87" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ForeignCurrencySwapsMember_019cb454-9c22-7d0a-b201-43b4d9f6dc30" xlink:href="fg-20260331.xsd#fg_ForeignCurrencySwapsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-79c8-895f-c605923919a2" xlink:to="loc_fg_ForeignCurrencySwapsMember_019cb454-9c22-7d0a-b201-43b4d9f6dc30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockOptionMember_019cb454-9c22-7da8-8d77-3eca35ffa1b1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-79c8-895f-c605923919a2" xlink:to="loc_us-gaap_StockOptionMember_019cb454-9c22-7da8-8d77-3eca35ffa1b1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FutureMember_019cb454-9c22-744e-913c-f220dcdeaaff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FutureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-79c8-895f-c605923919a2" xlink:to="loc_us-gaap_FutureMember_019cb454-9c22-744e-913c-f220dcdeaaff" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_OtherDerivativeInvestmentsMember_019cb454-9c22-77d2-9956-a04a4fcf16a2" xlink:href="fg-20260331.xsd#fg_OtherDerivativeInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-79c8-895f-c605923919a2" xlink:to="loc_fg_OtherDerivativeInvestmentsMember_019cb454-9c22-77d2-9956-a04a4fcf16a2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019cb454-9c22-71dc-9fd9-30be2912a011" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmbeddedDerivativeFinancialInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-79c8-895f-c605923919a2" xlink:to="loc_us-gaap_EmbeddedDerivativeFinancialInstrumentsMember_019cb454-9c22-71dc-9fd9-30be2912a011" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FixedAnnuityIULEmbeddedDerivativesMember_019cb454-9c22-7205-958c-b14144972423" xlink:href="fg-20260331.xsd#fg_FixedAnnuityIULEmbeddedDerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-79c8-895f-c605923919a2" xlink:to="loc_fg_FixedAnnuityIULEmbeddedDerivativesMember_019cb454-9c22-7205-958c-b14144972423" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_EmbeddedDerivativesInReinsuranceContractsMember_019cb454-9c22-7ae2-be51-c255d308721a" xlink:href="fg-20260331.xsd#fg_EmbeddedDerivativesInReinsuranceContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-79c8-895f-c605923919a2" xlink:to="loc_fg_EmbeddedDerivativesInReinsuranceContractsMember_019cb454-9c22-7ae2-be51-c255d308721a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019cb454-9c22-7ce1-b33c-c87f9d131c4a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019cb454-9c22-7a3b-b579-85acab6e1a89" xlink:to="loc_us-gaap_HedgingDesignationAxis_019cb454-9c22-7ce1-b33c-c87f9d131c4a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019cb454-9c22-7ce1-b33c-c87f9d131c4a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019cb454-9c22-7ce1-b33c-c87f9d131c4a" xlink:to="loc_us-gaap_HedgingDesignationDomain_019cb454-9c22-7ce1-b33c-c87f9d131c4a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019cb454-9c22-732e-9c4c-c9988ad29206" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019cb454-9c22-7ce1-b33c-c87f9d131c4a" xlink:to="loc_us-gaap_HedgingDesignationDomain_019cb454-9c22-732e-9c4c-c9988ad29206" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019cb454-9c22-7fab-a0dd-e1ee68d18794" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019cb454-9c22-732e-9c4c-c9988ad29206" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_019cb454-9c22-7fab-a0dd-e1ee68d18794" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019cb454-9c22-7f6e-9f2d-0e8cb0e6af11" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019cb454-9c22-732e-9c4c-c9988ad29206" xlink:to="loc_us-gaap_NondesignatedMember_019cb454-9c22-7f6e-9f2d-0e8cb0e6af11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019cb454-9c22-70ac-966f-1be1cf271f77" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019cb454-9c22-7a3b-b579-85acab6e1a89" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019cb454-9c22-70ac-966f-1be1cf271f77" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019cb454-9c22-70ac-966f-1be1cf271f77_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019cb454-9c22-70ac-966f-1be1cf271f77" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019cb454-9c22-70ac-966f-1be1cf271f77_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_019cb454-9c22-7c1c-a4ae-464116268176" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_019cb454-9c22-70ac-966f-1be1cf271f77" xlink:to="loc_us-gaap_HedgingRelationshipDomain_019cb454-9c22-7c1c-a4ae-464116268176" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueHedgingMember_019cb454-9c22-7273-b7ed-d40b3eeda474" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_019cb454-9c22-7c1c-a4ae-464116268176" xlink:to="loc_us-gaap_FairValueHedgingMember_019cb454-9c22-7273-b7ed-d40b3eeda474" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_019cb454-9c22-73f5-8bc6-8df4a2748138" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeGainLossOnDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cb454-9c22-7a1a-9ebf-3d18318945a5" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_019cb454-9c22-73f5-8bc6-8df4a2748138" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_019cb454-9c22-7b47-ae98-b150f07c2018" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cb454-9c22-7a1a-9ebf-3d18318945a5" xlink:to="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_019cb454-9c22-7b47-ae98-b150f07c2018" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_019cb454-9c22-748a-a547-42a5a9f1d182" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cb454-9c22-7a1a-9ebf-3d18318945a5" xlink:to="loc_us-gaap_DerivativeGainLossStatementOfIncomeOrComprehensiveIncomeExtensibleEnumeration_019cb454-9c22-748a-a547-42a5a9f1d182" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/DerivativeFinancialInstrumentsNarrativeDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#DerivativeFinancialInstrumentsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/DerivativeFinancialInstrumentsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_019cb454-9c22-7e47-9d9c-2b88c744a553" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_019cb454-9c22-7276-9e61-a1e3fd22c1f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeLineItems_019cb454-9c22-7e47-9d9c-2b88c744a553" xlink:to="loc_us-gaap_DerivativeTable_019cb454-9c22-7276-9e61-a1e3fd22c1f3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9c22-7ceb-992b-1dc25a2403d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019cb454-9c22-7276-9e61-a1e3fd22c1f3" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9c22-7ceb-992b-1dc25a2403d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-7ceb-992b-1dc25a2403d8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9c22-7ceb-992b-1dc25a2403d8" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-7ceb-992b-1dc25a2403d8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-7728-9fec-3314363aa856" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9c22-7ceb-992b-1dc25a2403d8" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-7728-9fec-3314363aa856" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CallOptionMember_019cb454-9c22-7b9b-9966-a4c55943863f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CallOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-7728-9fec-3314363aa856" xlink:to="loc_us-gaap_CallOptionMember_019cb454-9c22-7b9b-9966-a4c55943863f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FutureMember_019cb454-9c22-72c9-92f8-2bb70e7ee7c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FutureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-7728-9fec-3314363aa856" xlink:to="loc_us-gaap_FutureMember_019cb454-9c22-72c9-92f8-2bb70e7ee7c8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019cb454-9c22-744a-b2a4-ae11d341dc2d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019cb454-9c22-7276-9e61-a1e3fd22c1f3" xlink:to="loc_srt_CounterpartyNameAxis_019cb454-9c22-744a-b2a4-ae11d341dc2d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019cb454-9c22-744a-b2a4-ae11d341dc2d_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_019cb454-9c22-744a-b2a4-ae11d341dc2d" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019cb454-9c22-744a-b2a4-ae11d341dc2d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019cb454-9c22-7812-89fb-3ebb6147d620" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_019cb454-9c22-744a-b2a4-ae11d341dc2d" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019cb454-9c22-7812-89fb-3ebb6147d620" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_AllCounterpartiesExceptMerrillLynchMember_019cb454-9c22-7a01-b3b8-3269f3a989da" xlink:href="fg-20260331.xsd#fg_AllCounterpartiesExceptMerrillLynchMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019cb454-9c22-7812-89fb-3ebb6147d620" xlink:to="loc_fg_AllCounterpartiesExceptMerrillLynchMember_019cb454-9c22-7a01-b3b8-3269f3a989da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_019cb454-9c22-7ec9-bbe8-62d43c89d18b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019cb454-9c22-7276-9e61-a1e3fd22c1f3" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_019cb454-9c22-7ec9-bbe8-62d43c89d18b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_019cb454-9c22-7ec9-bbe8-62d43c89d18b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_019cb454-9c22-7ec9-bbe8-62d43c89d18b" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_019cb454-9c22-7ec9-bbe8-62d43c89d18b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_019cb454-9c22-7343-8ed0-65bc132798f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_019cb454-9c22-7ec9-bbe8-62d43c89d18b" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_019cb454-9c22-7343-8ed0-65bc132798f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DerivativesForTradingAndInvestmentMember_019cb454-9c22-7753-90fb-df6eb7e097df" xlink:href="fg-20260331.xsd#fg_DerivativesForTradingAndInvestmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_019cb454-9c22-7343-8ed0-65bc132798f0" xlink:to="loc_fg_DerivativesForTradingAndInvestmentMember_019cb454-9c22-7753-90fb-df6eb7e097df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsMember_019cb454-9c22-7ba7-aedd-7914bacede8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_019cb454-9c22-7343-8ed0-65bc132798f0" xlink:to="loc_us-gaap_CashAndCashEquivalentsMember_019cb454-9c22-7ba7-aedd-7914bacede8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019cb454-9c22-79a3-b2fb-3e020d9b1c3e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeTable_019cb454-9c22-7276-9e61-a1e3fd22c1f3" xlink:to="loc_us-gaap_HedgingDesignationAxis_019cb454-9c22-79a3-b2fb-3e020d9b1c3e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019cb454-9c22-79a3-b2fb-3e020d9b1c3e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019cb454-9c22-79a3-b2fb-3e020d9b1c3e" xlink:to="loc_us-gaap_HedgingDesignationDomain_019cb454-9c22-79a3-b2fb-3e020d9b1c3e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019cb454-9c22-7f3b-9c8f-77531d95cd47" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019cb454-9c22-79a3-b2fb-3e020d9b1c3e" xlink:to="loc_us-gaap_HedgingDesignationDomain_019cb454-9c22-7f3b-9c8f-77531d95cd47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019cb454-9c22-7cc3-8982-4ba4580224cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019cb454-9c22-7f3b-9c8f-77531d95cd47" xlink:to="loc_us-gaap_NondesignatedMember_019cb454-9c22-7cc3-8982-4ba4580224cc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgedAssetDiscontinuedFairValueHedgeCumulativeIncreaseDecrease_019cb454-9c22-7ce8-8004-515f1492de14" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgedAssetDiscontinuedFairValueHedgeCumulativeIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cb454-9c22-7e47-9d9c-2b88c744a553" xlink:to="loc_us-gaap_HedgedAssetDiscontinuedFairValueHedgeCumulativeIncreaseDecrease_019cb454-9c22-7ce8-8004-515f1492de14" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgedLiabilityDiscontinuedFairValueHedgeCumulativeIncreaseDecrease_019cb454-9c22-7588-8f41-cc6180bdc655" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgedLiabilityDiscontinuedFairValueHedgeCumulativeIncreaseDecrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cb454-9c22-7e47-9d9c-2b88c744a553" xlink:to="loc_us-gaap_HedgedLiabilityDiscontinuedFairValueHedgeCumulativeIncreaseDecrease_019cb454-9c22-7588-8f41-cc6180bdc655" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_NumberOfCounterpartiesDerivativesCollateralNetExposureThresholdNotSetToZero_019cb454-9c22-72c2-b3b7-96edfe7e7edc" xlink:href="fg-20260331.xsd#fg_NumberOfCounterpartiesDerivativesCollateralNetExposureThresholdNotSetToZero"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cb454-9c22-7e47-9d9c-2b88c744a553" xlink:to="loc_fg_NumberOfCounterpartiesDerivativesCollateralNetExposureThresholdNotSetToZero_019cb454-9c22-72c2-b3b7-96edfe7e7edc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DerivativesCollateralNetExposureThresholdForWhichCollateralRequired_019cb454-9c22-7a8c-a07f-fd66e54516dc" xlink:href="fg-20260331.xsd#fg_DerivativesCollateralNetExposureThresholdForWhichCollateralRequired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cb454-9c22-7e47-9d9c-2b88c744a553" xlink:to="loc_fg_DerivativesCollateralNetExposureThresholdForWhichCollateralRequired_019cb454-9c22-7a8c-a07f-fd66e54516dc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_019cb454-9c22-7f20-bc5b-11790534981a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cb454-9c22-7e47-9d9c-2b88c744a553" xlink:to="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_019cb454-9c22-7f20-bc5b-11790534981a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_019cb454-9c22-79c1-b145-be37b6e52d2c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cb454-9c22-7e47-9d9c-2b88c744a553" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_019cb454-9c22-79c1-b145-be37b6e52d2c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNumberOfInstrumentsHeld_019cb454-9c22-7c06-9699-928a459819a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNumberOfInstrumentsHeld"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cb454-9c22-7e47-9d9c-2b88c744a553" xlink:to="loc_us-gaap_DerivativeNumberOfInstrumentsHeld_019cb454-9c22-7c06-9699-928a459819a7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralAlreadyPostedAggregateFairValue_019cb454-9c22-7d2f-a2db-4d1f72ff28be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralAlreadyPostedAggregateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeLineItems_019cb454-9c22-7e47-9d9c-2b88c744a553" xlink:to="loc_us-gaap_CollateralAlreadyPostedAggregateFairValue_019cb454-9c22-7d2f-a2db-4d1f72ff28be" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/DerivativeFinancialInstrumentsInformationRegardingExposuretoCreditLossonCallOptionsHeldDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#DerivativeFinancialInstrumentsInformationRegardingExposuretoCreditLossonCallOptionsHeldDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/DerivativeFinancialInstrumentsInformationRegardingExposuretoCreditLossonCallOptionsHeldDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_019cb454-9c22-76e2-b706-6896cebc9377" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativesFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019cb454-9c22-726a-99c3-416570b51d03" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019cb454-9c22-76e2-b706-6896cebc9377" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019cb454-9c22-726a-99c3-416570b51d03" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9c22-705f-939e-a0e7b36844b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019cb454-9c22-726a-99c3-416570b51d03" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9c22-705f-939e-a0e7b36844b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-705f-939e-a0e7b36844b8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9c22-705f-939e-a0e7b36844b8" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-705f-939e-a0e7b36844b8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-7d3b-a1ed-318a9d2a2737" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_019cb454-9c22-705f-939e-a0e7b36844b8" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-7d3b-a1ed-318a9d2a2737" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DerivativeInstrumentsExcludingFuturesMember_019cb454-9c22-730b-a01c-084ab34a1b5c" xlink:href="fg-20260331.xsd#fg_DerivativeInstrumentsExcludingFuturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_019cb454-9c22-7d3b-a1ed-318a9d2a2737" xlink:to="loc_fg_DerivativeInstrumentsExcludingFuturesMember_019cb454-9c22-730b-a01c-084ab34a1b5c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_019cb454-9c22-7ccf-8d19-3f796a32784b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019cb454-9c22-726a-99c3-416570b51d03" xlink:to="loc_us-gaap_HedgingDesignationAxis_019cb454-9c22-7ccf-8d19-3f796a32784b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019cb454-9c22-7ccf-8d19-3f796a32784b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_019cb454-9c22-7ccf-8d19-3f796a32784b" xlink:to="loc_us-gaap_HedgingDesignationDomain_019cb454-9c22-7ccf-8d19-3f796a32784b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_019cb454-9c22-70a2-a082-74a8c2725558" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_019cb454-9c22-7ccf-8d19-3f796a32784b" xlink:to="loc_us-gaap_HedgingDesignationDomain_019cb454-9c22-70a2-a082-74a8c2725558" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_019cb454-9c22-7a23-ba13-b4c9c8320dfa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_019cb454-9c22-70a2-a082-74a8c2725558" xlink:to="loc_us-gaap_NondesignatedMember_019cb454-9c22-7a23-ba13-b4c9c8320dfa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_019dceb3-6017-7f92-bdff-1e59dee8ac86" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_019cb454-9c22-726a-99c3-416570b51d03" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_019dceb3-6017-7f92-bdff-1e59dee8ac86" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019dceb3-6017-7f92-bdff-1e59dee8ac86_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019dceb3-6017-7f92-bdff-1e59dee8ac86" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019dceb3-6017-7f92-bdff-1e59dee8ac86_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_019dceb3-6017-7060-829c-d36e36d4ca69" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_019dceb3-6017-7f92-bdff-1e59dee8ac86" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_019dceb3-6017-7060-829c-d36e36d4ca69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_019dceb3-8a34-7c37-8f98-2507dfd013c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_019dceb3-6017-7060-829c-d36e36d4ca69" xlink:to="loc_us-gaap_SubsequentEventMember_019dceb3-8a34-7c37-8f98-2507dfd013c0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019cb454-9c22-7246-b2a8-dca16acd9470" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019cb454-9c22-76e2-b706-6896cebc9377" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_019cb454-9c22-7246-b2a8-dca16acd9470" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_019cb454-9c22-77e8-8321-c617cca0f996" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019cb454-9c22-76e2-b706-6896cebc9377" xlink:to="loc_us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset_019cb454-9c22-77e8-8321-c617cca0f996" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_019cb454-9c22-7847-9980-b2d69ab5cdf1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019cb454-9c22-76e2-b706-6896cebc9377" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral_019cb454-9c22-7847-9980-b2d69ab5cdf1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DerivativeAssetSubjectToMasterNettingArrangementCollateralObligationToReturnCashIncreaseDecreaseInCollateral_019dfc6b-1ef2-7f29-b772-68d4f963d443" xlink:href="fg-20260331.xsd#fg_DerivativeAssetSubjectToMasterNettingArrangementCollateralObligationToReturnCashIncreaseDecreaseInCollateral"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_019cb454-9c22-76e2-b706-6896cebc9377" xlink:to="loc_fg_DerivativeAssetSubjectToMasterNettingArrangementCollateralObligationToReturnCashIncreaseDecreaseInCollateral_019dfc6b-1ef2-7f29-b772-68d4f963d443" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/ReinsuranceEffectofReinsuranceonPremiumsEarnedandBenefitsIncurredandReserveChangesDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#ReinsuranceEffectofReinsuranceonPremiumsEarnedandBenefitsIncurredandReserveChangesDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/ReinsuranceEffectofReinsuranceonPremiumsEarnedandBenefitsIncurredandReserveChangesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectsOfReinsuranceLineItems_019cb454-9c22-7640-bd40-ac226d31e0bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectsOfReinsuranceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectsOfReinsuranceTable_019cb454-9c22-7706-8c45-3b11011465f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectsOfReinsuranceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019cb454-9c22-7640-bd40-ac226d31e0bd" xlink:to="loc_us-gaap_EffectsOfReinsuranceTable_019cb454-9c22-7706-8c45-3b11011465f4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb454-9c22-7457-b1cf-d4e2df60b830" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_EffectsOfReinsuranceTable_019cb454-9c22-7706-8c45-3b11011465f4" xlink:to="loc_srt_ProductOrServiceAxis_019cb454-9c22-7457-b1cf-d4e2df60b830" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7457-b1cf-d4e2df60b830_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9c22-7457-b1cf-d4e2df60b830" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7457-b1cf-d4e2df60b830_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9c22-725c-b8e0-add395f0967f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9c22-7457-b1cf-d4e2df60b830" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9c22-725c-b8e0-add395f0967f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LifeInsuranceSegmentMember_019cb454-9c22-7102-b160-a8dc89b73536" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LifeInsuranceSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-725c-b8e0-add395f0967f" xlink:to="loc_us-gaap_LifeInsuranceSegmentMember_019cb454-9c22-7102-b160-a8dc89b73536" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmountAbstract_019cb454-9c22-7a91-aa39-6b013b6a4cd9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmountAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019cb454-9c22-7640-bd40-ac226d31e0bd" xlink:to="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmountAbstract_019cb454-9c22-7a91-aa39-6b013b6a4cd9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DirectPremiumsEarned_019cb454-9c22-7927-92d3-5712a0f666cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DirectPremiumsEarned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmountAbstract_019cb454-9c22-7a91-aa39-6b013b6a4cd9" xlink:to="loc_us-gaap_DirectPremiumsEarned_019cb454-9c22-7927-92d3-5712a0f666cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededPremiumsEarned_019cb454-9c22-77e0-9b34-f8a61bb6d5dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededPremiumsEarned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmountAbstract_019cb454-9c22-7a91-aa39-6b013b6a4cd9" xlink:to="loc_us-gaap_CededPremiumsEarned_019cb454-9c22-77e0-9b34-f8a61bb6d5dd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PremiumsEarnedNet_019cb454-9c22-7899-848d-e89b2fd445ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PremiumsEarnedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentNetAmountAbstract_019cb454-9c22-7a91-aa39-6b013b6a4cd9" xlink:to="loc_us-gaap_PremiumsEarnedNet_019cb454-9c22-7899-848d-e89b2fd445ec" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_NetProductFeesAbstract_019d487a-a1ce-713a-81e0-e7f7be94a22a" xlink:href="fg-20260331.xsd#fg_NetProductFeesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019cb454-9c22-7640-bd40-ac226d31e0bd" xlink:to="loc_fg_NetProductFeesAbstract_019d487a-a1ce-713a-81e0-e7f7be94a22a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DirectProductFees_019d487a-1996-7174-99d7-bb3028e293a4" xlink:href="fg-20260331.xsd#fg_DirectProductFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_NetProductFeesAbstract_019d487a-a1ce-713a-81e0-e7f7be94a22a" xlink:to="loc_fg_DirectProductFees_019d487a-1996-7174-99d7-bb3028e293a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_CededProductFees_019d487a-1996-76a9-8fe2-c4f6189751c6" xlink:href="fg-20260331.xsd#fg_CededProductFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_NetProductFeesAbstract_019d487a-a1ce-713a-81e0-e7f7be94a22a" xlink:to="loc_fg_CededProductFees_019d487a-1996-76a9-8fe2-c4f6189751c6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ProductFeeNet_019d487a-1996-7170-93fc-d268f6a1081f" xlink:href="fg-20260331.xsd#fg_ProductFeeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_NetProductFeesAbstract_019d487a-a1ce-713a-81e0-e7f7be94a22a" xlink:to="loc_fg_ProductFeeNet_019d487a-1996-7170-93fc-d268f6a1081f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNetAbstract_019cb454-9c22-7ea4-b610-2e2ff353a205" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderBenefitsAndClaimsIncurredNetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019cb454-9c22-7640-bd40-ac226d31e0bd" xlink:to="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNetAbstract_019cb454-9c22-7ea4-b610-2e2ff353a205" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredGross_019cb454-9c22-7682-8f24-9455cd307629" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderBenefitsAndClaimsIncurredGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNetAbstract_019cb454-9c22-7ea4-b610-2e2ff353a205" xlink:to="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredGross_019cb454-9c22-7682-8f24-9455cd307629" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded_019cb454-9c22-7215-a603-56fcc9c9171b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNetAbstract_019cb454-9c22-7ea4-b610-2e2ff353a205" xlink:to="loc_us-gaap_ReinsuranceEffectOnClaimsAndBenefitsIncurredAmountCeded_019cb454-9c22-7215-a603-56fcc9c9171b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNet_019cb454-9c22-7d93-b7ae-6ff7fd206d50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderBenefitsAndClaimsIncurredNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNetAbstract_019cb454-9c22-7ea4-b610-2e2ff353a205" xlink:to="loc_us-gaap_PolicyholderBenefitsAndClaimsIncurredNet_019cb454-9c22-7d93-b7ae-6ff7fd206d50" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/ReinsuranceSummaryofReinsuranceRecoverableDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#ReinsuranceSummaryofReinsuranceRecoverableDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/ReinsuranceSummaryofReinsuranceRecoverableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectsOfReinsuranceLineItems_019cb454-9c22-7508-b8ab-172672187c99" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectsOfReinsuranceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectsOfReinsuranceTable_019cb454-9c22-7478-a11c-42b4425e9aab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectsOfReinsuranceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019cb454-9c22-7508-b8ab-172672187c99" xlink:to="loc_us-gaap_EffectsOfReinsuranceTable_019cb454-9c22-7478-a11c-42b4425e9aab" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskAxis_019cb454-9c22-7b4b-b677-b5267aa248b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_EffectsOfReinsuranceTable_019cb454-9c22-7478-a11c-42b4425e9aab" xlink:to="loc_us-gaap_CededCreditRiskAxis_019cb454-9c22-7b4b-b677-b5267aa248b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskReinsurerDomain_019cb454-9c22-7b4b-b677-b5267aa248b7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskReinsurerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CededCreditRiskAxis_019cb454-9c22-7b4b-b677-b5267aa248b7" xlink:to="loc_us-gaap_CededCreditRiskReinsurerDomain_019cb454-9c22-7b4b-b677-b5267aa248b7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskReinsurerDomain_019cb454-9c22-7dd9-9cad-1c2d8354567d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskReinsurerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CededCreditRiskAxis_019cb454-9c22-7b4b-b677-b5267aa248b7" xlink:to="loc_us-gaap_CededCreditRiskReinsurerDomain_019cb454-9c22-7dd9-9cad-1c2d8354567d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_AspidaMember_019cb454-9c22-7948-9fe1-d5c45b963d82" xlink:href="fg-20260331.xsd#fg_AspidaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_019cb454-9c22-7dd9-9cad-1c2d8354567d" xlink:to="loc_fg_AspidaMember_019cb454-9c22-7948-9fe1-d5c45b963d82" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_SomersetMember_019cb454-9c22-7418-b56e-4ef5bffa504c" xlink:href="fg-20260331.xsd#fg_SomersetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_019cb454-9c22-7dd9-9cad-1c2d8354567d" xlink:to="loc_fg_SomersetMember_019cb454-9c22-7418-b56e-4ef5bffa504c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_EverlakeLifeInsuranceCompanyMember_019cb454-9c22-7621-8c75-c5702c182d7b" xlink:href="fg-20260331.xsd#fg_EverlakeLifeInsuranceCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_019cb454-9c22-7dd9-9cad-1c2d8354567d" xlink:to="loc_fg_EverlakeLifeInsuranceCompanyMember_019cb454-9c22-7621-8c75-c5702c182d7b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_AncientReMember_019dceb6-dda3-7bdf-ab06-851d87e76d15" xlink:href="fg-20260331.xsd#fg_AncientReMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_019cb454-9c22-7dd9-9cad-1c2d8354567d" xlink:to="loc_fg_AncientReMember_019dceb6-dda3-7bdf-ab06-851d87e76d15" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_WiltonReassuranceCompanyMember_019dceb7-801f-7ff3-b315-417d7d5b1b0c" xlink:href="fg-20260331.xsd#fg_WiltonReassuranceCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_019cb454-9c22-7dd9-9cad-1c2d8354567d" xlink:to="loc_fg_WiltonReassuranceCompanyMember_019dceb7-801f-7ff3-b315-417d7d5b1b0c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherReinsurerMember_019cb454-9c22-79d7-8bde-72ff77db216d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherReinsurerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_019cb454-9c22-7dd9-9cad-1c2d8354567d" xlink:to="loc_us-gaap_OtherReinsurerMember_019cb454-9c22-79d7-8bde-72ff77db216d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb454-9c22-7475-b89a-c55a28540102" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_EffectsOfReinsuranceTable_019cb454-9c22-7478-a11c-42b4425e9aab" xlink:to="loc_srt_ProductOrServiceAxis_019cb454-9c22-7475-b89a-c55a28540102" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7475-b89a-c55a28540102_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9c22-7475-b89a-c55a28540102" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7475-b89a-c55a28540102_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7d6f-93cb-2da6e29d1802" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9c22-7475-b89a-c55a28540102" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7d6f-93cb-2da6e29d1802" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_CertainMYGAMember_019cb454-9c22-7a34-abb2-2a764ee8f531" xlink:href="fg-20260331.xsd#fg_CertainMYGAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7d6f-93cb-2da6e29d1802" xlink:to="loc_fg_CertainMYGAMember_019cb454-9c22-7a34-abb2-2a764ee8f531" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_CertainMYGAAndDeferredAnnuitiesMember_019cb454-9c22-737b-bb63-3652014c1fd7" xlink:href="fg-20260331.xsd#fg_CertainMYGAAndDeferredAnnuitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7d6f-93cb-2da6e29d1802" xlink:to="loc_fg_CertainMYGAAndDeferredAnnuitiesMember_019cb454-9c22-737b-bb63-3652014c1fd7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_CertainFIAMember_019dceb5-998b-7c6d-9b1b-10cf30799162" xlink:href="fg-20260331.xsd#fg_CertainFIAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7d6f-93cb-2da6e29d1802" xlink:to="loc_fg_CertainFIAMember_019dceb5-998b-7c6d-9b1b-10cf30799162" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_BlockOfTraditionalIULAndULMember_019cb454-9c22-7d11-8868-02a3751811a2" xlink:href="fg-20260331.xsd#fg_BlockOfTraditionalIULAndULMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7d6f-93cb-2da6e29d1802" xlink:to="loc_fg_BlockOfTraditionalIULAndULMember_019cb454-9c22-7d11-8868-02a3751811a2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverablesGross_019cb454-9c22-7ad7-b7f5-11b385c30600" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReinsuranceRecoverablesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019cb454-9c22-7508-b8ab-172672187c99" xlink:to="loc_us-gaap_ReinsuranceRecoverablesGross_019cb454-9c22-7ad7-b7f5-11b385c30600" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverablesAllowance_019cb454-9c22-74fd-92be-97bb2e6bc252" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReinsuranceRecoverablesAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019cb454-9c22-7508-b8ab-172672187c99" xlink:to="loc_us-gaap_ReinsuranceRecoverablesAllowance_019cb454-9c22-74fd-92be-97bb2e6bc252" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverables_019cb454-9c22-7d47-8788-56099721b6c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReinsuranceRecoverables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019cb454-9c22-7508-b8ab-172672187c99" xlink:to="loc_us-gaap_ReinsuranceRecoverables_019cb454-9c22-7d47-8788-56099721b6c3" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/ReinsuranceScheduleofAssetsHeldinSupportofReservesAssociatedwithCoinsurancewithFundsWithheldAgreementDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#ReinsuranceScheduleofAssetsHeldinSupportofReservesAssociatedwithCoinsurancewithFundsWithheldAgreementDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/ReinsuranceScheduleofAssetsHeldinSupportofReservesAssociatedwithCoinsurancewithFundsWithheldAgreementDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectsOfReinsuranceLineItems_019cb454-9c22-7f23-b445-26a6f5e0592b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectsOfReinsuranceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectsOfReinsuranceTable_019cb454-9c22-7bb9-91e4-9a7242e2d6d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EffectsOfReinsuranceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019cb454-9c22-7f23-b445-26a6f5e0592b" xlink:to="loc_us-gaap_EffectsOfReinsuranceTable_019cb454-9c22-7bb9-91e4-9a7242e2d6d8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_TypesOfFundsHeldUnderReinsuranceAgreementsAssetsAxis_019cb454-9c22-74d6-aeef-fc5b17f7b15c" xlink:href="fg-20260331.xsd#fg_TypesOfFundsHeldUnderReinsuranceAgreementsAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_EffectsOfReinsuranceTable_019cb454-9c22-7bb9-91e4-9a7242e2d6d8" xlink:to="loc_fg_TypesOfFundsHeldUnderReinsuranceAgreementsAssetsAxis_019cb454-9c22-74d6-aeef-fc5b17f7b15c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_TypesOfFundsHeldUnderReinsuranceAgreementsAssetsDomain_019cb454-9c22-74d6-aeef-fc5b17f7b15c_default" xlink:href="fg-20260331.xsd#fg_TypesOfFundsHeldUnderReinsuranceAgreementsAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_fg_TypesOfFundsHeldUnderReinsuranceAgreementsAssetsAxis_019cb454-9c22-74d6-aeef-fc5b17f7b15c" xlink:to="loc_fg_TypesOfFundsHeldUnderReinsuranceAgreementsAssetsDomain_019cb454-9c22-74d6-aeef-fc5b17f7b15c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_TypesOfFundsHeldUnderReinsuranceAgreementsAssetsDomain_019cb454-9c22-7f63-9ee0-03ee9ae51381" xlink:href="fg-20260331.xsd#fg_TypesOfFundsHeldUnderReinsuranceAgreementsAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_fg_TypesOfFundsHeldUnderReinsuranceAgreementsAssetsAxis_019cb454-9c22-74d6-aeef-fc5b17f7b15c" xlink:to="loc_fg_TypesOfFundsHeldUnderReinsuranceAgreementsAssetsDomain_019cb454-9c22-7f63-9ee0-03ee9ae51381" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FixedMaturitiesAvailableForSaleMember_019cb454-9c22-7073-a98e-788ffddf0e42" xlink:href="fg-20260331.xsd#fg_FixedMaturitiesAvailableForSaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_TypesOfFundsHeldUnderReinsuranceAgreementsAssetsDomain_019cb454-9c22-7f63-9ee0-03ee9ae51381" xlink:to="loc_fg_FixedMaturitiesAvailableForSaleMember_019cb454-9c22-7073-a98e-788ffddf0e42" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_019cb454-9c22-7456-8268-b396baddb4a4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_TypesOfFundsHeldUnderReinsuranceAgreementsAssetsDomain_019cb454-9c22-7f63-9ee0-03ee9ae51381" xlink:to="loc_us-gaap_EquitySecuritiesMember_019cb454-9c22-7456-8268-b396baddb4a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFinancialInstrumentsAssetsMember_019d4874-5a3a-73b3-83c0-34f55db9c6a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFinancialInstrumentsAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_TypesOfFundsHeldUnderReinsuranceAgreementsAssetsDomain_019cb454-9c22-7f63-9ee0-03ee9ae51381" xlink:to="loc_us-gaap_DerivativeFinancialInstrumentsAssetsMember_019d4874-5a3a-73b3-83c0-34f55db9c6a7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MortgageLoansMember_019d4874-bda3-7328-b795-4ceb6b71940f" xlink:href="fg-20260331.xsd#fg_MortgageLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_TypesOfFundsHeldUnderReinsuranceAgreementsAssetsDomain_019cb454-9c22-7f63-9ee0-03ee9ae51381" xlink:to="loc_fg_MortgageLoansMember_019d4874-bda3-7328-b795-4ceb6b71940f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_UnconsolidatedInvestmentsMember_019d4876-4be6-7874-9e36-d5e6ba7faf6a" xlink:href="fg-20260331.xsd#fg_UnconsolidatedInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_TypesOfFundsHeldUnderReinsuranceAgreementsAssetsDomain_019cb454-9c22-7f63-9ee0-03ee9ae51381" xlink:to="loc_fg_UnconsolidatedInvestmentsMember_019d4876-4be6-7874-9e36-d5e6ba7faf6a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyLoansMember_019d4877-6219-7279-8700-3684cd388ac3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_TypesOfFundsHeldUnderReinsuranceAgreementsAssetsDomain_019cb454-9c22-7f63-9ee0-03ee9ae51381" xlink:to="loc_us-gaap_PolicyLoansMember_019d4877-6219-7279-8700-3684cd388ac3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsMember_019cb454-9c22-7473-b171-2392b1a3ca3c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_TypesOfFundsHeldUnderReinsuranceAgreementsAssetsDomain_019cb454-9c22-7f63-9ee0-03ee9ae51381" xlink:to="loc_us-gaap_CashAndCashEquivalentsMember_019cb454-9c22-7473-b171-2392b1a3ca3c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_AccruedInterestIncomeReceivableMember_019cb454-9c22-7924-8d8a-42fc7ff3b3e9" xlink:href="fg-20260331.xsd#fg_AccruedInterestIncomeReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_TypesOfFundsHeldUnderReinsuranceAgreementsAssetsDomain_019cb454-9c22-7f63-9ee0-03ee9ae51381" xlink:to="loc_fg_AccruedInterestIncomeReceivableMember_019cb454-9c22-7924-8d8a-42fc7ff3b3e9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesMember_019de522-c880-7e37-a327-39d70901079d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_TypesOfFundsHeldUnderReinsuranceAgreementsAssetsDomain_019cb454-9c22-7f63-9ee0-03ee9ae51381" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesMember_019de522-c880-7e37-a327-39d70901079d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FundsHeldUnderReinsuranceAgreementsAsset_019cb454-9c22-75a1-8ce8-ae657ac46df8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FundsHeldUnderReinsuranceAgreementsAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019cb454-9c22-7f23-b445-26a6f5e0592b" xlink:to="loc_us-gaap_FundsHeldUnderReinsuranceAgreementsAsset_019cb454-9c22-75a1-8ce8-ae657ac46df8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FundsHeldUnderReinsuranceAgreementsLiability_019df9b2-723f-7926-aa34-8073fbb573c4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FundsHeldUnderReinsuranceAgreementsLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EffectsOfReinsuranceLineItems_019cb454-9c22-7f23-b445-26a6f5e0592b" xlink:to="loc_us-gaap_FundsHeldUnderReinsuranceAgreementsLiability_019df9b2-723f-7926-aa34-8073fbb573c4" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/IntangiblesReconciliationofOtherIntangiblestoBalanceSheetDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#IntangiblesReconciliationofOtherIntangiblestoBalanceSheetDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/IntangiblesReconciliationofOtherIntangiblestoBalanceSheetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cb454-9c22-7ca9-afa8-e95aa63deabb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019cb454-9c22-786a-a8ad-5521c839a609" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cb454-9c22-7ca9-afa8-e95aa63deabb" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019cb454-9c22-786a-a8ad-5521c839a609" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019cb454-9c22-7584-a3cb-061c20ca7414" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019cb454-9c22-786a-a8ad-5521c839a609" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019cb454-9c22-7584-a3cb-061c20ca7414" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cb454-9c22-7584-a3cb-061c20ca7414_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019cb454-9c22-7584-a3cb-061c20ca7414" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cb454-9c22-7584-a3cb-061c20ca7414_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cb454-9c22-7ef4-8353-b6608d99fe31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019cb454-9c22-7584-a3cb-061c20ca7414" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cb454-9c22-7ef4-8353-b6608d99fe31" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ValueOfDistributionAssetMember_019cb454-9c22-7dba-a236-cf040cdbb66f" xlink:href="fg-20260331.xsd#fg_ValueOfDistributionAssetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cb454-9c22-7ef4-8353-b6608d99fe31" xlink:to="loc_fg_ValueOfDistributionAssetMember_019cb454-9c22-7dba-a236-cf040cdbb66f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_019cb454-9c22-757e-b6de-002a7a2003eb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComputerSoftwareIntangibleAssetMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cb454-9c22-7ef4-8353-b6608d99fe31" xlink:to="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_019cb454-9c22-757e-b6de-002a7a2003eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_TrademarksTradenamesAndOtherMember_019cb454-9c22-7da6-8264-e5cbe5f73b77" xlink:href="fg-20260331.xsd#fg_TrademarksTradenamesAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cb454-9c22-7ef4-8353-b6608d99fe31" xlink:to="loc_fg_TrademarksTradenamesAndOtherMember_019cb454-9c22-7da6-8264-e5cbe5f73b77" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019cb454-9c22-7c48-9c2c-bb7f6bbe2d49" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cb454-9c22-7ef4-8353-b6608d99fe31" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019cb454-9c22-7c48-9c2c-bb7f6bbe2d49" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019cb454-9c22-70d4-9496-e2ec52582740" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019cb454-9c22-786a-a8ad-5521c839a609" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019cb454-9c22-70d4-9496-e2ec52582740" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019cb454-9c22-70d4-9496-e2ec52582740_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019cb454-9c22-70d4-9496-e2ec52582740" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019cb454-9c22-70d4-9496-e2ec52582740_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019cb454-9c22-7227-be07-3a899b2b72f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_019cb454-9c22-70d4-9496-e2ec52582740" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019cb454-9c22-7227-be07-3a899b2b72f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TrademarksAndTradeNamesMember_019cb454-9c22-78ab-ad51-49cac8c33515" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TrademarksAndTradeNamesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_019cb454-9c22-7227-be07-3a899b2b72f8" xlink:to="loc_us-gaap_TrademarksAndTradeNamesMember_019cb454-9c22-78ab-ad51-49cac8c33515" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValueOfBusinessAcquiredVOBA_019cb454-9c22-7851-875c-b5903519205d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValueOfBusinessAcquiredVOBA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cb454-9c22-7ca9-afa8-e95aa63deabb" xlink:to="loc_us-gaap_ValueOfBusinessAcquiredVOBA_019cb454-9c22-7851-875c-b5903519205d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DeferredPolicyAcquisitionCostsIncludingFundingAgreementsAndPensionRiskTransfers_019cb454-9c22-7c5c-bda2-5de59cb15a6e" xlink:href="fg-20260331.xsd#fg_DeferredPolicyAcquisitionCostsIncludingFundingAgreementsAndPensionRiskTransfers"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cb454-9c22-7ca9-afa8-e95aa63deabb" xlink:to="loc_fg_DeferredPolicyAcquisitionCostsIncludingFundingAgreementsAndPensionRiskTransfers_019cb454-9c22-7c5c-bda2-5de59cb15a6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredSalesInducementsNet_019cb454-9c22-7c14-a190-1d073808cb28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredSalesInducementsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cb454-9c22-7ca9-afa8-e95aa63deabb" xlink:to="loc_us-gaap_DeferredSalesInducementsNet_019cb454-9c22-7c14-a190-1d073808cb28" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019cb454-9c22-7b3f-9c42-fec091846e50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cb454-9c22-7ca9-afa8-e95aa63deabb" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019cb454-9c22-7b3f-9c42-fec091846e50" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_019cb454-9c22-7523-85ca-114b31b2cced" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cb454-9c22-7ca9-afa8-e95aa63deabb" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_019cb454-9c22-7523-85ca-114b31b2cced" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIntangibleAssetsNet_019cb454-9c22-7938-bdd6-dfb1f3ff5f35" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cb454-9c22-7ca9-afa8-e95aa63deabb" xlink:to="loc_us-gaap_OtherIntangibleAssetsNet_019cb454-9c22-7938-bdd6-dfb1f3ff5f35" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/IntangiblesVOBADetails" xlink:type="simple" xlink:href="fg-20260331.xsd#IntangiblesVOBADetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/IntangiblesVOBADetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PresentValueOfFutureInsuranceProfitLineItems_019cb454-9c22-71bf-8f5d-81a62b54851f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PresentValueOfFutureInsuranceProfitLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PresentValueOfFutureInsuranceProfitTable_019cb454-9c22-78d1-8092-31a4f0f9a716" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PresentValueOfFutureInsuranceProfitTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PresentValueOfFutureInsuranceProfitLineItems_019cb454-9c22-71bf-8f5d-81a62b54851f" xlink:to="loc_us-gaap_PresentValueOfFutureInsuranceProfitTable_019cb454-9c22-78d1-8092-31a4f0f9a716" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb454-9c22-72c6-a8b2-d2678a0efba0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PresentValueOfFutureInsuranceProfitTable_019cb454-9c22-78d1-8092-31a4f0f9a716" xlink:to="loc_srt_ProductOrServiceAxis_019cb454-9c22-72c6-a8b2-d2678a0efba0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9c22-72c6-a8b2-d2678a0efba0_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9c22-72c6-a8b2-d2678a0efba0" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9c22-72c6-a8b2-d2678a0efba0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9c22-737c-9f01-a93224f1302f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9c22-72c6-a8b2-d2678a0efba0" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9c22-737c-9f01-a93224f1302f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_019cb454-9c22-732c-9882-d901a2232660" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-737c-9f01-a93224f1302f" xlink:to="loc_us-gaap_IndexedAnnuityMember_019cb454-9c22-732c-9882-d901a2232660" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedAnnuityMember_019cb454-9c22-748e-a802-033303ecb9ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-737c-9f01-a93224f1302f" xlink:to="loc_us-gaap_FixedAnnuityMember_019cb454-9c22-748e-a802-033303ecb9ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ImmediateAnnuityMember_019cb454-9c22-7810-a62b-bf64cc0d229c" xlink:href="fg-20260331.xsd#fg_ImmediateAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-737c-9f01-a93224f1302f" xlink:to="loc_fg_ImmediateAnnuityMember_019cb454-9c22-7810-a62b-bf64cc0d229c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UniversalLifeMember_019cb454-9c22-74e5-a6c6-4cb72d53ddc9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UniversalLifeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-737c-9f01-a93224f1302f" xlink:to="loc_us-gaap_UniversalLifeMember_019cb454-9c22-74e5-a6c6-4cb72d53ddc9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_TraditionalLifeInsuranceMember_019cb454-9c22-746a-b9ed-14b6f4408dae" xlink:href="fg-20260331.xsd#fg_TraditionalLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-737c-9f01-a93224f1302f" xlink:to="loc_fg_TraditionalLifeInsuranceMember_019cb454-9c22-746a-b9ed-14b6f4408dae" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward_019cb454-9c22-7331-a931-7ce540d6b9a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PresentValueOfFutureInsuranceProfitLineItems_019cb454-9c22-71bf-8f5d-81a62b54851f" xlink:to="loc_us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward_019cb454-9c22-7331-a931-7ce540d6b9a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValueOfBusinessAcquiredVOBA_019cb454-9c22-7b5a-987b-d55d2ec6cbc5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValueOfBusinessAcquiredVOBA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward_019cb454-9c22-7331-a931-7ce540d6b9a5" xlink:to="loc_us-gaap_ValueOfBusinessAcquiredVOBA_019cb454-9c22-7b5a-987b-d55d2ec6cbc5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PresentValueOfFutureInsuranceProfitsAmortizationExpense1_019cb454-9c22-77fe-9350-50a5f0a12a18" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PresentValueOfFutureInsuranceProfitsAmortizationExpense1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInPresentValueOfFutureInsuranceProfitsRollForward_019cb454-9c22-7331-a931-7ce540d6b9a5" xlink:to="loc_us-gaap_PresentValueOfFutureInsuranceProfitsAmortizationExpense1_019cb454-9c22-77fe-9350-50a5f0a12a18" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValueOfBusinessAcquiredVOBA_019cb454-9c22-7773-afbc-8f77b663c375" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValueOfBusinessAcquiredVOBA"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/IntangiblesNarrativeDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#IntangiblesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/IntangiblesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cb454-9c22-7c0e-b5f6-0575d1b393b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019cb454-9c22-7292-b14b-8107f9cea64d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cb454-9c22-7c0e-b5f6-0575d1b393b7" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019cb454-9c22-7292-b14b-8107f9cea64d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb454-9c22-75e2-b5af-7bbd1c1a5a3d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019cb454-9c22-7292-b14b-8107f9cea64d" xlink:to="loc_srt_ProductOrServiceAxis_019cb454-9c22-75e2-b5af-7bbd1c1a5a3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9c22-75e2-b5af-7bbd1c1a5a3d_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9c22-75e2-b5af-7bbd1c1a5a3d" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9c22-75e2-b5af-7bbd1c1a5a3d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7617-8ee9-7180281d1a2a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9c22-75e2-b5af-7bbd1c1a5a3d" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7617-8ee9-7180281d1a2a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_019cb454-9c22-7d8e-a995-32195f63f1ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7617-8ee9-7180281d1a2a" xlink:to="loc_us-gaap_IndexedAnnuityMember_019cb454-9c22-7d8e-a995-32195f63f1ea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019dcebc-064c-7716-ad0c-32f78327ad64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019cb454-9c22-7292-b14b-8107f9cea64d" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019dcebc-064c-7716-ad0c-32f78327ad64" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dcebc-064c-7716-ad0c-32f78327ad64_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019dcebc-064c-7716-ad0c-32f78327ad64" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dcebc-064c-7716-ad0c-32f78327ad64_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dcebc-064c-77a7-9e4e-5366a5ea152e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_019dcebc-064c-7716-ad0c-32f78327ad64" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dcebc-064c-77a7-9e4e-5366a5ea152e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_AncientFinancialHoldingsLPMember_019dcebc-064c-7fbd-9205-e4daa610bce0" xlink:href="fg-20260331.xsd#fg_AncientFinancialHoldingsLPMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_019dcebc-064c-77a7-9e4e-5366a5ea152e" xlink:to="loc_fg_AncientFinancialHoldingsLPMember_019dcebc-064c-7fbd-9205-e4daa610bce0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PresentValueOfFutureInsuranceProfitsAmortizationExpense1_019cb454-9c22-7bb6-9636-cb6340609a2c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PresentValueOfFutureInsuranceProfitsAmortizationExpense1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cb454-9c22-7c0e-b5f6-0575d1b393b7" xlink:to="loc_us-gaap_PresentValueOfFutureInsuranceProfitsAmortizationExpense1_019cb454-9c22-7bb6-9636-cb6340609a2c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense_019cb454-9c22-7da3-a7b6-e18a6be50b64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cb454-9c22-7c0e-b5f6-0575d1b393b7" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense_019cb454-9c22-7da3-a7b6-e18a6be50b64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredSalesInducementsAmortizationExpense_019cb454-9c22-7fc7-acaf-aecc50c7a0d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredSalesInducementsAmortizationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cb454-9c22-7c0e-b5f6-0575d1b393b7" xlink:to="loc_us-gaap_DeferredSalesInducementsAmortizationExpense_019cb454-9c22-7fc7-acaf-aecc50c7a0d5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_019dcebc-064c-7b73-9c56-a591947cf18b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cb454-9c22-7c0e-b5f6-0575d1b393b7" xlink:to="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_019dcebc-064c-7b73-9c56-a591947cf18b" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/IntangiblesDACDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#IntangiblesDACDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/IntangiblesDACDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostLineItems_019cb454-9c22-778b-89b7-b65b7f09749a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredPolicyAcquisitionCostLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostTable_019cb454-9c22-7dc7-8cbc-544e1f9e1907" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredPolicyAcquisitionCostTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DeferredPolicyAcquisitionCostLineItems_019cb454-9c22-778b-89b7-b65b7f09749a" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCostTable_019cb454-9c22-7dc7-8cbc-544e1f9e1907" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb454-9c22-7c9d-b10d-6b2d624b00a3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DeferredPolicyAcquisitionCostTable_019cb454-9c22-7dc7-8cbc-544e1f9e1907" xlink:to="loc_srt_ProductOrServiceAxis_019cb454-9c22-7c9d-b10d-6b2d624b00a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7c9d-b10d-6b2d624b00a3_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9c22-7c9d-b10d-6b2d624b00a3" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7c9d-b10d-6b2d624b00a3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9c22-721b-9d6a-5931ae9354c0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9c22-7c9d-b10d-6b2d624b00a3" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9c22-721b-9d6a-5931ae9354c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_019cb454-9c22-7b02-8395-dc69ad31b7f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-721b-9d6a-5931ae9354c0" xlink:to="loc_us-gaap_IndexedAnnuityMember_019cb454-9c22-7b02-8395-dc69ad31b7f5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedAnnuityMember_019cb454-9c22-7674-8a32-4272201e4e69" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-721b-9d6a-5931ae9354c0" xlink:to="loc_us-gaap_FixedAnnuityMember_019cb454-9c22-7674-8a32-4272201e4e69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UniversalLifeMember_019cb454-9c22-72af-9d24-551d69e89748" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UniversalLifeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-721b-9d6a-5931ae9354c0" xlink:to="loc_us-gaap_UniversalLifeMember_019cb454-9c22-72af-9d24-551d69e89748" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward_019cb454-9c22-735c-8051-6110d3d4a434" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredPolicyAcquisitionCostLineItems_019cb454-9c22-778b-89b7-b65b7f09749a" xlink:to="loc_us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward_019cb454-9c22-735c-8051-6110d3d4a434" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCosts_019cb454-9c22-7c5c-abce-7060b5725d4c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredPolicyAcquisitionCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward_019cb454-9c22-735c-8051-6110d3d4a434" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCosts_019cb454-9c22-7c5c-abce-7060b5725d4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostsAdditions_019cb454-9c22-720e-9c3e-2c3a4f723948" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredPolicyAcquisitionCostsAdditions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward_019cb454-9c22-735c-8051-6110d3d4a434" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCostsAdditions_019cb454-9c22-720e-9c3e-2c3a4f723948" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense_019cb454-9c22-752f-9975-0b02a3e4f3cc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementAnalysisOfDeferredPolicyAcquisitionCostsRollForward_019cb454-9c22-735c-8051-6110d3d4a434" xlink:to="loc_us-gaap_DeferredPolicyAcquisitionCostAmortizationExpense_019cb454-9c22-752f-9975-0b02a3e4f3cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredPolicyAcquisitionCosts_019cb454-9c22-7c03-97f6-5d2b018c0ea0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredPolicyAcquisitionCosts"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/IntangiblesReconciliationofDACtotheCondensedConsolidatedBalanceSheetsDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#IntangiblesReconciliationofDACtotheCondensedConsolidatedBalanceSheetsDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/IntangiblesReconciliationofDACtotheCondensedConsolidatedBalanceSheetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cb454-9c22-7192-a191-9df1924d8da8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019cb454-9c22-711e-91f8-f6663bf04b70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cb454-9c22-7192-a191-9df1924d8da8" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019cb454-9c22-711e-91f8-f6663bf04b70" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb454-9c22-70d2-9a1f-d2146a22b6b4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019cb454-9c22-711e-91f8-f6663bf04b70" xlink:to="loc_srt_ProductOrServiceAxis_019cb454-9c22-70d2-9a1f-d2146a22b6b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9c22-70d2-9a1f-d2146a22b6b4_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9c22-70d2-9a1f-d2146a22b6b4" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9c22-70d2-9a1f-d2146a22b6b4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9c22-71b6-bf91-c66a4e120069" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9c22-70d2-9a1f-d2146a22b6b4" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9c22-71b6-bf91-c66a4e120069" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_019cb454-9c22-7f53-b061-4969da8b4564" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-71b6-bf91-c66a4e120069" xlink:to="loc_us-gaap_IndexedAnnuityMember_019cb454-9c22-7f53-b061-4969da8b4564" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedAnnuityMember_019cb454-9c22-7db4-8022-94ab6c361afa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-71b6-bf91-c66a4e120069" xlink:to="loc_us-gaap_FixedAnnuityMember_019cb454-9c22-7db4-8022-94ab6c361afa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UniversalLifeMember_019cb454-9c22-7f49-9f26-0b2454529c9a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UniversalLifeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-71b6-bf91-c66a4e120069" xlink:to="loc_us-gaap_UniversalLifeMember_019cb454-9c22-7f49-9f26-0b2454529c9a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FundingAgreementsMember_019cb454-9c22-7b61-a491-f12ea2c24a84" xlink:href="fg-20260331.xsd#fg_FundingAgreementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-71b6-bf91-c66a4e120069" xlink:to="loc_fg_FundingAgreementsMember_019cb454-9c22-7b61-a491-f12ea2c24a84" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PensionRiskTransfersMember_019cb454-9c22-7804-94bf-28ef904fee38" xlink:href="fg-20260331.xsd#fg_PensionRiskTransfersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-71b6-bf91-c66a4e120069" xlink:to="loc_fg_PensionRiskTransfersMember_019cb454-9c22-7804-94bf-28ef904fee38" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DeferredPolicyAcquisitionCostsIncludingFundingAgreementsAndPensionRiskTransfers_019cb454-9c22-7edc-8785-662e2fb72040" xlink:href="fg-20260331.xsd#fg_DeferredPolicyAcquisitionCostsIncludingFundingAgreementsAndPensionRiskTransfers"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cb454-9c22-7192-a191-9df1924d8da8" xlink:to="loc_fg_DeferredPolicyAcquisitionCostsIncludingFundingAgreementsAndPensionRiskTransfers_019cb454-9c22-7edc-8785-662e2fb72040" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/IntangiblesDSIDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#IntangiblesDSIDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/IntangiblesDSIDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredSaleInducementCostLineItems_019cb454-9c22-7856-a764-a934dd601d39" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredSaleInducementCostLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredSaleInducementCostTable_019cb454-9c22-7b2e-9073-3fb46e6cfb70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredSaleInducementCostTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DeferredSaleInducementCostLineItems_019cb454-9c22-7856-a764-a934dd601d39" xlink:to="loc_us-gaap_DeferredSaleInducementCostTable_019cb454-9c22-7b2e-9073-3fb46e6cfb70" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb454-9c22-7088-9427-5c0bb49943b5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DeferredSaleInducementCostTable_019cb454-9c22-7b2e-9073-3fb46e6cfb70" xlink:to="loc_srt_ProductOrServiceAxis_019cb454-9c22-7088-9427-5c0bb49943b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7088-9427-5c0bb49943b5_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9c22-7088-9427-5c0bb49943b5" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7088-9427-5c0bb49943b5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7ccf-a703-5ed445d16a15" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9c22-7088-9427-5c0bb49943b5" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7ccf-a703-5ed445d16a15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_019cb454-9c22-7daf-9912-fec3eb40bbd1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7ccf-a703-5ed445d16a15" xlink:to="loc_us-gaap_IndexedAnnuityMember_019cb454-9c22-7daf-9912-fec3eb40bbd1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MovementInDeferredSalesInducementsRollForward_019cb454-9c22-73ee-9b9f-bc8256009c59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MovementInDeferredSalesInducementsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DeferredSaleInducementCostLineItems_019cb454-9c22-7856-a764-a934dd601d39" xlink:to="loc_us-gaap_MovementInDeferredSalesInducementsRollForward_019cb454-9c22-73ee-9b9f-bc8256009c59" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredSalesInducementsNet_019cb454-9c22-76aa-b04f-0a93929bdc04" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredSalesInducementsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInDeferredSalesInducementsRollForward_019cb454-9c22-73ee-9b9f-bc8256009c59" xlink:to="loc_us-gaap_DeferredSalesInducementsNet_019cb454-9c22-76aa-b04f-0a93929bdc04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredSalesInducementsAdditions_019cb454-9c22-7386-9c64-4bc09a2ed97a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredSalesInducementsAdditions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInDeferredSalesInducementsRollForward_019cb454-9c22-73ee-9b9f-bc8256009c59" xlink:to="loc_us-gaap_DeferredSalesInducementsAdditions_019cb454-9c22-7386-9c64-4bc09a2ed97a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredSalesInducementsAmortizationExpense_019cb454-9c22-76a5-be8b-743d5834bde7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredSalesInducementsAmortizationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MovementInDeferredSalesInducementsRollForward_019cb454-9c22-73ee-9b9f-bc8256009c59" xlink:to="loc_us-gaap_DeferredSalesInducementsAmortizationExpense_019cb454-9c22-76a5-be8b-743d5834bde7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredSalesInducementsNet_019cb454-9c22-72f3-858b-4b6f2e491f14" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredSalesInducementsNet"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/IntangiblesRollforwardofCustomerRelationshipIntangiblesAcquiredintheRoarAcquisitionDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#IntangiblesRollforwardofCustomerRelationshipIntangiblesAcquiredintheRoarAcquisitionDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/IntangiblesRollforwardofCustomerRelationshipIntangiblesAcquiredintheRoarAcquisitionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cb454-9c22-7b7a-8260-a1ad09ea9e2b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019cb454-9c22-7948-b0c2-9963987daa59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cb454-9c22-7b7a-8260-a1ad09ea9e2b" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019cb454-9c22-7948-b0c2-9963987daa59" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019cb454-9c22-7b7b-a690-29a64500f069" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019cb454-9c22-7948-b0c2-9963987daa59" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019cb454-9c22-7b7b-a690-29a64500f069" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cb454-9c22-7b7b-a690-29a64500f069_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019cb454-9c22-7b7b-a690-29a64500f069" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cb454-9c22-7b7b-a690-29a64500f069_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cb454-9c22-76d6-a937-880663f741c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_019cb454-9c22-7b7b-a690-29a64500f069" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cb454-9c22-76d6-a937-880663f741c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_019cb454-9c22-7fee-92ef-fb99e994a4df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_019cb454-9c22-76d6-a937-880663f741c2" xlink:to="loc_us-gaap_CustomerRelationshipsMember_019cb454-9c22-7fee-92ef-fb99e994a4df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019cb454-9c22-71cf-b255-fc5787373553" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_019cb454-9c22-7948-b0c2-9963987daa59" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019cb454-9c22-71cf-b255-fc5787373553" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb454-9c22-71cf-b255-fc5787373553_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019cb454-9c22-71cf-b255-fc5787373553" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb454-9c22-71cf-b255-fc5787373553_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb454-9c22-7261-bf38-bc298b5e91c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019cb454-9c22-71cf-b255-fc5787373553" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb454-9c22-7261-bf38-bc298b5e91c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_RoarAndPALHMember_019cb454-9c22-7b1e-b9af-f9d02cb30b3b" xlink:href="fg-20260331.xsd#fg_RoarAndPALHMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019cb454-9c22-7261-bf38-bc298b5e91c9" xlink:to="loc_fg_RoarAndPALHMember_019cb454-9c22-7b1e-b9af-f9d02cb30b3b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019cb454-9c22-7a9d-a0b4-5b3b9d9d05f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_019cb454-9c22-7b7a-8260-a1ad09ea9e2b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019cb454-9c22-7a9d-a0b4-5b3b9d9d05f4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019cb454-9c22-7518-95ac-222791fad483" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019cb454-9c22-7a9d-a0b4-5b3b9d9d05f4" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019cb454-9c22-7518-95ac-222791fad483" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_019cb454-9c22-75d6-9baf-f604bb8df793" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_019cb454-9c22-7a9d-a0b4-5b3b9d9d05f4" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_019cb454-9c22-75d6-9baf-f604bb8df793" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_019cb454-9c22-7d0f-aaca-c27581f8dbc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/MarketRiskBenefitsBalancesandChangesinMarketRiskBenefitDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#MarketRiskBenefitsBalancesandChangesinMarketRiskBenefitDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/MarketRiskBenefitsBalancesandChangesinMarketRiskBenefitDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitLineItems_019cb454-9c22-733e-a292-b114094ba951" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitTable_019cb454-9c22-7d2f-9008-ab1b9edafd00" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019cb454-9c22-733e-a292-b114094ba951" xlink:to="loc_us-gaap_MarketRiskBenefitTable_019cb454-9c22-7d2f-9008-ab1b9edafd00" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb454-9c22-759e-b05f-8c17246ce039" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MarketRiskBenefitTable_019cb454-9c22-7d2f-9008-ab1b9edafd00" xlink:to="loc_srt_ProductOrServiceAxis_019cb454-9c22-759e-b05f-8c17246ce039" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9c22-759e-b05f-8c17246ce039_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9c22-759e-b05f-8c17246ce039" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9c22-759e-b05f-8c17246ce039_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7fe0-8b05-abb91b1a5017" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9c22-759e-b05f-8c17246ce039" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7fe0-8b05-abb91b1a5017" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_019cb454-9c22-778d-9635-9aa7e90cb301" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7fe0-8b05-abb91b1a5017" xlink:to="loc_us-gaap_IndexedAnnuityMember_019cb454-9c22-778d-9635-9aa7e90cb301" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedAnnuityMember_019cb454-9c22-7c45-a185-0f96c86116ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7fe0-8b05-abb91b1a5017" xlink:to="loc_us-gaap_FixedAnnuityMember_019cb454-9c22-7c45-a185-0f96c86116ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MarketRiskBenefitChangesInMarketRiskBenefitRollForward_019cb454-9c22-73cf-b6a1-611f6d405625" xlink:href="fg-20260331.xsd#fg_MarketRiskBenefitChangesInMarketRiskBenefitRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019cb454-9c22-733e-a292-b114094ba951" xlink:to="loc_fg_MarketRiskBenefitChangesInMarketRiskBenefitRollForward_019cb454-9c22-73cf-b6a1-611f6d405625" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk_019cb454-9c22-74c6-a911-485b3e283952" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_MarketRiskBenefitChangesInMarketRiskBenefitRollForward_019cb454-9c22-73cf-b6a1-611f6d405625" xlink:to="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk_019cb454-9c22-74c6-a911-485b3e283952" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_019cb454-9c22-74af-bb7a-920ea1c6c229" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_MarketRiskBenefitChangesInMarketRiskBenefitRollForward_019cb454-9c22-73cf-b6a1-611f6d405625" xlink:to="loc_us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_019cb454-9c22-74af-bb7a-920ea1c6c229" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MarketRiskBenefitIssuanceAndBenefitPayments_019cb454-9c22-7c55-93ce-8005934be2e8" xlink:href="fg-20260331.xsd#fg_MarketRiskBenefitIssuanceAndBenefitPayments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_019cb454-9c22-74af-bb7a-920ea1c6c229" xlink:to="loc_fg_MarketRiskBenefitIssuanceAndBenefitPayments_019cb454-9c22-7c55-93ce-8005934be2e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAttributedFeeCollected_019cb454-9c22-7f53-9fe9-058d34e70282" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitAttributedFeeCollected"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_019cb454-9c22-74af-bb7a-920ea1c6c229" xlink:to="loc_us-gaap_MarketRiskBenefitAttributedFeeCollected_019cb454-9c22-7f53-9fe9-058d34e70282" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromActualPolicyholderBehaviorDifferentFromExpected_019cb454-9c22-769f-bb31-e87aeea01841" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitIncreaseDecreaseFromActualPolicyholderBehaviorDifferentFromExpected"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_019cb454-9c22-74af-bb7a-920ea1c6c229" xlink:to="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromActualPolicyholderBehaviorDifferentFromExpected_019cb454-9c22-769f-bb31-e87aeea01841" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromOtherAssumption_019cb454-9c22-7a7f-bcd3-50b91bb5dbc2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitIncreaseDecreaseFromOtherAssumption"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_019cb454-9c22-74af-bb7a-920ea1c6c229" xlink:to="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromOtherAssumption_019cb454-9c22-7a7f-bcd3-50b91bb5dbc2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromEquityMarketChange_019cb454-9c22-7829-89a4-2f58bf29ec70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitIncreaseDecreaseFromEquityMarketChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_019cb454-9c22-74af-bb7a-920ea1c6c229" xlink:to="loc_us-gaap_MarketRiskBenefitIncreaseDecreaseFromEquityMarketChange_019cb454-9c22-7829-89a4-2f58bf29ec70" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_019cb454-9c22-7f16-a10e-02a3e448b8f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitBeforeReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskBeforeTax_019cb454-9c22-7250-b44a-b57f653c7a54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_MarketRiskBenefitChangesInMarketRiskBenefitRollForward_019cb454-9c22-73cf-b6a1-611f6d405625" xlink:to="loc_us-gaap_AociMarketRiskBenefitInstrumentSpecificCreditRiskBeforeTax_019cb454-9c22-7250-b44a-b57f653c7a54" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk_019cb454-9c22-727a-9cba-8b58291e7a1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitAfterIncreaseDecreaseFromInstrumentSpecificCreditRisk"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitReinsuranceRecoverableAfterAllowance_019cb454-9c22-7dcc-ba57-07d46fd5e160" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitReinsuranceRecoverableAfterAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_MarketRiskBenefitChangesInMarketRiskBenefitRollForward_019cb454-9c22-73cf-b6a1-611f6d405625" xlink:to="loc_us-gaap_MarketRiskBenefitReinsuranceRecoverableAfterAllowance_019cb454-9c22-7dcc-ba57-07d46fd5e160" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAfterReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_019cb454-9c22-72db-b0c3-b837c8e01d0e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitAfterReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_MarketRiskBenefitChangesInMarketRiskBenefitRollForward_019cb454-9c22-73cf-b6a1-611f6d405625" xlink:to="loc_us-gaap_MarketRiskBenefitAfterReinsuranceAndCumulativeIncreaseDecreaseFromInstrumentSpecificCreditRiskChange_019cb454-9c22-72db-b0c3-b837c8e01d0e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_NetAmountAtRiskByProductAndGuaranteeWeightedAverageAttainedAgeOfPolicyholdersWeightedByTotalAV_019cb454-9c22-7399-a586-9c67785184ae" xlink:href="fg-20260331.xsd#fg_NetAmountAtRiskByProductAndGuaranteeWeightedAverageAttainedAgeOfPolicyholdersWeightedByTotalAV"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_MarketRiskBenefitChangesInMarketRiskBenefitRollForward_019cb454-9c22-73cf-b6a1-611f6d405625" xlink:to="loc_fg_NetAmountAtRiskByProductAndGuaranteeWeightedAverageAttainedAgeOfPolicyholdersWeightedByTotalAV_019cb454-9c22-7399-a586-9c67785184ae" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitNetAmountAtRisk_019cb454-9c22-71e3-a3a5-a76dc4266734" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitNetAmountAtRisk"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_MarketRiskBenefitChangesInMarketRiskBenefitRollForward_019cb454-9c22-73cf-b6a1-611f6d405625" xlink:to="loc_us-gaap_MarketRiskBenefitNetAmountAtRisk_019cb454-9c22-71e3-a3a5-a76dc4266734" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/MarketRiskBenefitsScheduleofReconciliationofAssetandLiabilityDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#MarketRiskBenefitsScheduleofReconciliationofAssetandLiabilityDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/MarketRiskBenefitsScheduleofReconciliationofAssetandLiabilityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitLineItems_019cb454-9c22-7a6a-948b-148c94e82ad2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitTable_019cb454-9c22-7259-b5b8-32c4fa2e8c58" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019cb454-9c22-7a6a-948b-148c94e82ad2" xlink:to="loc_us-gaap_MarketRiskBenefitTable_019cb454-9c22-7259-b5b8-32c4fa2e8c58" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb454-9c22-721c-84b5-147482fc1fbf" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MarketRiskBenefitTable_019cb454-9c22-7259-b5b8-32c4fa2e8c58" xlink:to="loc_srt_ProductOrServiceAxis_019cb454-9c22-721c-84b5-147482fc1fbf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9c22-721c-84b5-147482fc1fbf_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9c22-721c-84b5-147482fc1fbf" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9c22-721c-84b5-147482fc1fbf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7b01-82ef-663fac47b448" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9c22-721c-84b5-147482fc1fbf" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7b01-82ef-663fac47b448" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_019cb454-9c22-77ea-963f-ca5b43674838" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7b01-82ef-663fac47b448" xlink:to="loc_us-gaap_IndexedAnnuityMember_019cb454-9c22-77ea-963f-ca5b43674838" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedAnnuityMember_019cb454-9c22-75d8-8701-8801f7d805bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9c22-7b01-82ef-663fac47b448" xlink:to="loc_us-gaap_FixedAnnuityMember_019cb454-9c22-75d8-8701-8801f7d805bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MarketRiskBenefitTypeAxis_019cb454-9c22-7820-95be-5a2ebd9970fd" xlink:href="fg-20260331.xsd#fg_MarketRiskBenefitTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_MarketRiskBenefitTable_019cb454-9c22-7259-b5b8-32c4fa2e8c58" xlink:to="loc_fg_MarketRiskBenefitTypeAxis_019cb454-9c22-7820-95be-5a2ebd9970fd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MarketRiskBenefitTypeDomain_019cb454-9c22-7820-95be-5a2ebd9970fd_default" xlink:href="fg-20260331.xsd#fg_MarketRiskBenefitTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_fg_MarketRiskBenefitTypeAxis_019cb454-9c22-7820-95be-5a2ebd9970fd" xlink:to="loc_fg_MarketRiskBenefitTypeDomain_019cb454-9c22-7820-95be-5a2ebd9970fd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_MarketRiskBenefitTypeDomain_019cb454-9c22-7753-be16-1902e8211fab" xlink:href="fg-20260331.xsd#fg_MarketRiskBenefitTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_fg_MarketRiskBenefitTypeAxis_019cb454-9c22-7820-95be-5a2ebd9970fd" xlink:to="loc_fg_MarketRiskBenefitTypeDomain_019cb454-9c22-7753-be16-1902e8211fab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DirectMember_019cb454-9c22-774a-973f-1e66de215b3e" xlink:href="fg-20260331.xsd#fg_DirectMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_MarketRiskBenefitTypeDomain_019cb454-9c22-7753-be16-1902e8211fab" xlink:to="loc_fg_DirectMember_019cb454-9c22-774a-973f-1e66de215b3e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ReinsuredMember_019cb454-9c22-7813-b330-8e999913ef29" xlink:href="fg-20260331.xsd#fg_ReinsuredMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_MarketRiskBenefitTypeDomain_019cb454-9c22-7753-be16-1902e8211fab" xlink:to="loc_fg_ReinsuredMember_019cb454-9c22-7813-b330-8e999913ef29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitAssetAmount_019cb454-9c22-7528-aab6-558327e457d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitAssetAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019cb454-9c22-7a6a-948b-148c94e82ad2" xlink:to="loc_us-gaap_MarketRiskBenefitAssetAmount_019cb454-9c22-7528-aab6-558327e457d2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitLiabilityAmount_019cb454-9c22-7008-b0b7-031e4d3f040f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitLiabilityAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MarketRiskBenefitLineItems_019cb454-9c22-7a6a-948b-148c94e82ad2" xlink:to="loc_us-gaap_MarketRiskBenefitLiabilityAmount_019cb454-9c22-7008-b0b7-031e4d3f040f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/ContractholderFundsSummaryofBalancesandChangesinContractholderFundsDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#ContractholderFundsSummaryofBalancesandChangesinContractholderFundsDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/ContractholderFundsSummaryofBalancesandChangesinContractholderFundsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceLineItems_019cb454-9ce5-7871-ac60-f8859f6bf55b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceTable_019cb454-9ce5-76b0-a83f-a036d342cb7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019cb454-9ce5-7871-ac60-f8859f6bf55b" xlink:to="loc_us-gaap_PolicyholderAccountBalanceTable_019cb454-9ce5-76b0-a83f-a036d342cb7b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb454-9ce5-78ae-b421-99fdfb62b82f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PolicyholderAccountBalanceTable_019cb454-9ce5-76b0-a83f-a036d342cb7b" xlink:to="loc_srt_ProductOrServiceAxis_019cb454-9ce5-78ae-b421-99fdfb62b82f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-78ae-b421-99fdfb62b82f_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9ce5-78ae-b421-99fdfb62b82f" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-78ae-b421-99fdfb62b82f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-747d-8372-748c96a86919" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9ce5-78ae-b421-99fdfb62b82f" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-747d-8372-748c96a86919" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_019cb454-9ce5-77b0-a536-6e9f50bb909c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-747d-8372-748c96a86919" xlink:to="loc_us-gaap_IndexedAnnuityMember_019cb454-9ce5-77b0-a536-6e9f50bb909c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedAnnuityMember_019cb454-9ce5-7c2d-80bf-e09b4955faec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-747d-8372-748c96a86919" xlink:to="loc_us-gaap_FixedAnnuityMember_019cb454-9ce5-7c2d-80bf-e09b4955faec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UniversalLifeMember_019cb454-9ce5-7d26-83d6-dcc54d4fc7d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UniversalLifeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-747d-8372-748c96a86919" xlink:to="loc_us-gaap_UniversalLifeMember_019cb454-9ce5-7d26-83d6-dcc54d4fc7d5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FundingAgreementsFABNMember_019cb454-9ce5-7ed9-ab9c-e4b1c781d6cc" xlink:href="fg-20260331.xsd#fg_FundingAgreementsFABNMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-747d-8372-748c96a86919" xlink:to="loc_fg_FundingAgreementsFABNMember_019cb454-9ce5-7ed9-ab9c-e4b1c781d6cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FundingAgreementsFederalHomeLoanBankMember_019cb454-9ce5-7171-88ba-5088e05b0864" xlink:href="fg-20260331.xsd#fg_FundingAgreementsFederalHomeLoanBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-747d-8372-748c96a86919" xlink:to="loc_fg_FundingAgreementsFederalHomeLoanBankMember_019cb454-9ce5-7171-88ba-5088e05b0864" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceRollForward_019cb454-9ce5-75ce-b5ca-da877f863858" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019cb454-9ce5-7871-ac60-f8859f6bf55b" xlink:to="loc_us-gaap_PolicyholderAccountBalanceRollForward_019cb454-9ce5-75ce-b5ca-da877f863858" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_019cb454-9ce5-7297-917a-4b50bd2ca419" xlink:href="fg-20260331.xsd#fg_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019cb454-9ce5-75ce-b5ca-da877f863858" xlink:to="loc_fg_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_019cb454-9ce5-7297-917a-4b50bd2ca419" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceIssuance_019cb454-9ce5-7d43-b465-0ff674556e0e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_019cb454-9ce5-7297-917a-4b50bd2ca419" xlink:to="loc_us-gaap_PolicyholderAccountBalanceIssuance_019cb454-9ce5-7d43-b465-0ff674556e0e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalancePremiumReceived_019cb454-9ce5-76b1-b683-ef0682f25bdd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalancePremiumReceived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_019cb454-9ce5-7297-917a-4b50bd2ca419" xlink:to="loc_us-gaap_PolicyholderAccountBalancePremiumReceived_019cb454-9ce5-76b1-b683-ef0682f25bdd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalancePolicyCharge_019cb454-9ce5-73b9-9197-187749dd8a78" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalancePolicyCharge"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_019cb454-9ce5-7297-917a-4b50bd2ca419" xlink:to="loc_us-gaap_PolicyholderAccountBalancePolicyCharge_019cb454-9ce5-73b9-9197-187749dd8a78" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceSurrenderAndWithdrawal_019cb454-9ce5-760e-bffa-fb924902c424" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceSurrenderAndWithdrawal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_019cb454-9ce5-7297-917a-4b50bd2ca419" xlink:to="loc_us-gaap_PolicyholderAccountBalanceSurrenderAndWithdrawal_019cb454-9ce5-760e-bffa-fb924902c424" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceBenefitPayment_019cb454-9ce5-75c8-8337-a6e9216f56ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceBenefitPayment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_019cb454-9ce5-7297-917a-4b50bd2ca419" xlink:to="loc_us-gaap_PolicyholderAccountBalanceBenefitPayment_019cb454-9ce5-75c8-8337-a6e9216f56ab" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestCreditedToPolicyholdersAccountBalances_019cb454-9ce5-7d68-b1ff-54d8aa2bb8bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestCreditedToPolicyholdersAccountBalances"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_019cb454-9ce5-7297-917a-4b50bd2ca419" xlink:to="loc_us-gaap_InterestCreditedToPolicyholdersAccountBalances_019cb454-9ce5-7d68-b1ff-54d8aa2bb8bd" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceIncreaseDecreaseFromOtherChange_019cb454-9ce5-7bb6-ba1d-dbebb9decabf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceIncreaseDecreaseFromOtherChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_019cb454-9ce5-7297-917a-4b50bd2ca419" xlink:to="loc_us-gaap_PolicyholderAccountBalanceIncreaseDecreaseFromOtherChange_019cb454-9ce5-7bb6-ba1d-dbebb9decabf" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_019cb454-9ce5-7859-a319-c0756af3d40e" xlink:href="fg-20260331.xsd#fg_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet_019cb454-9ce5-78a3-a399-4f4d1419ddd7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019cb454-9ce5-75ce-b5ca-da877f863858" xlink:to="loc_us-gaap_EmbeddedDerivativeGainLossOnEmbeddedDerivativeNet_019cb454-9ce5-78a3-a399-4f4d1419ddd7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PolicyHolderAccountBalanceGrossLiability_019cb454-9ce5-75fc-a837-6cb1628f8501" xlink:href="fg-20260331.xsd#fg_PolicyHolderAccountBalanceGrossLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019cb454-9ce5-75ce-b5ca-da877f863858" xlink:to="loc_fg_PolicyHolderAccountBalanceGrossLiability_019cb454-9ce5-75fc-a837-6cb1628f8501" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReinsuranceRecoverables_019cb454-9ce5-7e1f-8cff-75b8b71bf1f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReinsuranceRecoverables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019cb454-9ce5-75ce-b5ca-da877f863858" xlink:to="loc_us-gaap_ReinsuranceRecoverables_019cb454-9ce5-7e1f-8cff-75b8b71bf1f7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PolicyholderAccountBalanceNetOfReinsurance_019cb454-9ce5-7e78-ad23-52d8e3b1827b" xlink:href="fg-20260331.xsd#fg_PolicyholderAccountBalanceNetOfReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019cb454-9ce5-75ce-b5ca-da877f863858" xlink:to="loc_fg_PolicyholderAccountBalanceNetOfReinsurance_019cb454-9ce5-7e78-ad23-52d8e3b1827b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceWeightedAverageCreditingRate_019cb454-9ce5-70d5-b12d-67fc9be0df0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceWeightedAverageCreditingRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019cb454-9ce5-75ce-b5ca-da877f863858" xlink:to="loc_us-gaap_PolicyholderAccountBalanceWeightedAverageCreditingRate_019cb454-9ce5-70d5-b12d-67fc9be0df0a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceNetAmountAtRisk_019cb454-9ce5-7693-b5ba-14ebf37e6a88" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceNetAmountAtRisk"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019cb454-9ce5-75ce-b5ca-da877f863858" xlink:to="loc_us-gaap_PolicyholderAccountBalanceNetAmountAtRisk_019cb454-9ce5-7693-b5ba-14ebf37e6a88" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashSurrenderValueDuePolicyholdersAmount_019cb454-9ce5-7f79-bbff-46ec52f557bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashSurrenderValueDuePolicyholdersAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceRollForward_019cb454-9ce5-75ce-b5ca-da877f863858" xlink:to="loc_us-gaap_CashSurrenderValueDuePolicyholdersAmount_019cb454-9ce5-7f79-bbff-46ec52f557bd" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/ContractholderFundsReconciliationtoCondensedConsolidatedBalanceSheetsDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#ContractholderFundsReconciliationtoCondensedConsolidatedBalanceSheetsDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/ContractholderFundsReconciliationtoCondensedConsolidatedBalanceSheetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceLineItems_019cb454-9ce5-707f-83b8-0c78978957c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceTable_019cb454-9ce5-7d71-adb2-1ab262f2a2a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019cb454-9ce5-707f-83b8-0c78978957c7" xlink:to="loc_us-gaap_PolicyholderAccountBalanceTable_019cb454-9ce5-7d71-adb2-1ab262f2a2a2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb454-9ce5-72ff-944f-6fd46564c8df" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PolicyholderAccountBalanceTable_019cb454-9ce5-7d71-adb2-1ab262f2a2a2" xlink:to="loc_srt_ProductOrServiceAxis_019cb454-9ce5-72ff-944f-6fd46564c8df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-72ff-944f-6fd46564c8df_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9ce5-72ff-944f-6fd46564c8df" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-72ff-944f-6fd46564c8df_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7112-81d9-5f8884aeca3b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9ce5-72ff-944f-6fd46564c8df" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7112-81d9-5f8884aeca3b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_019cb454-9ce5-7788-88c4-b54052fe40a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7112-81d9-5f8884aeca3b" xlink:to="loc_us-gaap_IndexedAnnuityMember_019cb454-9ce5-7788-88c4-b54052fe40a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedAnnuityMember_019cb454-9ce5-7a81-bad5-035d5497f2a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7112-81d9-5f8884aeca3b" xlink:to="loc_us-gaap_FixedAnnuityMember_019cb454-9ce5-7a81-bad5-035d5497f2a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ImmediateAnnuityMember_019cb454-9ce5-76ea-8d64-81a055815f4b" xlink:href="fg-20260331.xsd#fg_ImmediateAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7112-81d9-5f8884aeca3b" xlink:to="loc_fg_ImmediateAnnuityMember_019cb454-9ce5-76ea-8d64-81a055815f4b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UniversalLifeMember_019cb454-9ce5-7b32-8ef0-1a6aab19d963" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UniversalLifeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7112-81d9-5f8884aeca3b" xlink:to="loc_us-gaap_UniversalLifeMember_019cb454-9ce5-7b32-8ef0-1a6aab19d963" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_TraditionalLifeInsuranceMember_019cb454-9ce5-7c72-b372-095e1336a838" xlink:href="fg-20260331.xsd#fg_TraditionalLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7112-81d9-5f8884aeca3b" xlink:to="loc_fg_TraditionalLifeInsuranceMember_019cb454-9ce5-7c72-b372-095e1336a838" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FundingAgreementsFABNMember_019cb454-9ce5-7606-bfcb-703c775aa20c" xlink:href="fg-20260331.xsd#fg_FundingAgreementsFABNMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7112-81d9-5f8884aeca3b" xlink:to="loc_fg_FundingAgreementsFABNMember_019cb454-9ce5-7606-bfcb-703c775aa20c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FundingAgreementsFederalHomeLoanBankMember_019cb454-9ce5-715c-b212-c8bc382c1072" xlink:href="fg-20260331.xsd#fg_FundingAgreementsFederalHomeLoanBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7112-81d9-5f8884aeca3b" xlink:to="loc_fg_FundingAgreementsFederalHomeLoanBankMember_019cb454-9ce5-715c-b212-c8bc382c1072" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PRTMember_019cb454-9ce5-7446-b37f-a48a0db3ef5b" xlink:href="fg-20260331.xsd#fg_PRTMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7112-81d9-5f8884aeca3b" xlink:to="loc_fg_PRTMember_019cb454-9ce5-7446-b37f-a48a0db3ef5b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PolicyHolderAccountBalanceGrossLiability_019cb454-9ce5-7c09-bcfc-9f58bd52b134" xlink:href="fg-20260331.xsd#fg_PolicyHolderAccountBalanceGrossLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019cb454-9ce5-707f-83b8-0c78978957c7" xlink:to="loc_fg_PolicyHolderAccountBalanceGrossLiability_019cb454-9ce5-7c09-bcfc-9f58bd52b134" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/ContractholderFundsAccountValuesbyRangeofGuaranteedMinimumCreditRatingDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#ContractholderFundsAccountValuesbyRangeofGuaranteedMinimumCreditRatingDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/ContractholderFundsAccountValuesbyRangeofGuaranteedMinimumCreditRatingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceLineItems_019cb454-9ce5-7a50-964d-7cee4095d9ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceTable_019cb454-9ce5-7fbe-9046-d4019948f5de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019cb454-9ce5-7a50-964d-7cee4095d9ca" xlink:to="loc_us-gaap_PolicyholderAccountBalanceTable_019cb454-9ce5-7fbe-9046-d4019948f5de" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb454-9ce5-76ee-a058-3a6062c75482" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PolicyholderAccountBalanceTable_019cb454-9ce5-7fbe-9046-d4019948f5de" xlink:to="loc_srt_ProductOrServiceAxis_019cb454-9ce5-76ee-a058-3a6062c75482" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-76ee-a058-3a6062c75482_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9ce5-76ee-a058-3a6062c75482" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-76ee-a058-3a6062c75482_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7f36-908b-9653e579c8db" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9ce5-76ee-a058-3a6062c75482" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7f36-908b-9653e579c8db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndexedAnnuityMember_019cb454-9ce5-70ca-a8cb-eb7833cd2ec7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IndexedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7f36-908b-9653e579c8db" xlink:to="loc_us-gaap_IndexedAnnuityMember_019cb454-9ce5-70ca-a8cb-eb7833cd2ec7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedAnnuityMember_019cb454-9ce5-7466-b772-68d78c129ea0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FixedAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7f36-908b-9653e579c8db" xlink:to="loc_us-gaap_FixedAnnuityMember_019cb454-9ce5-7466-b772-68d78c129ea0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UniversalLifeMember_019cb454-9ce5-7456-9592-ff21ad5a6f76" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UniversalLifeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7f36-908b-9653e579c8db" xlink:to="loc_us-gaap_UniversalLifeMember_019cb454-9ce5-7456-9592-ff21ad5a6f76" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis_019cb454-9ce5-775d-92d5-775791d8d0fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PolicyholderAccountBalanceTable_019cb454-9ce5-7fbe-9046-d4019948f5de" xlink:to="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis_019cb454-9ce5-775d-92d5-775791d8d0fe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_019cb454-9ce5-775d-92d5-775791d8d0fe_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis_019cb454-9ce5-775d-92d5-775791d8d0fe" xlink:to="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_019cb454-9ce5-775d-92d5-775791d8d0fe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_019cb454-9ce5-783f-ac40-1e661df40dbe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeAxis_019cb454-9ce5-775d-92d5-775791d8d0fe" xlink:to="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_019cb454-9ce5-783f-ac40-1e661df40dbe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom000To150Member_019cb454-9ce5-798d-8f02-050831623016" xlink:href="fg-20260331.xsd#fg_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom000To150Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_019cb454-9ce5-783f-ac40-1e661df40dbe" xlink:to="loc_fg_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom000To150Member_019cb454-9ce5-798d-8f02-050831623016" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom151To250Member_019cb454-9ce5-76ce-90e2-493f11e636f8" xlink:href="fg-20260331.xsd#fg_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom151To250Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_019cb454-9ce5-783f-ac40-1e661df40dbe" xlink:to="loc_fg_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom151To250Member_019cb454-9ce5-76ce-90e2-493f11e636f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeGreaterThan250Member_019cb454-9ce5-7d4b-9d9d-914f1997c25e" xlink:href="fg-20260331.xsd#fg_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeGreaterThan250Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeDomain_019cb454-9ce5-783f-ac40-1e661df40dbe" xlink:to="loc_fg_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeGreaterThan250Member_019cb454-9ce5-7d4b-9d9d-914f1997c25e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis_019cb454-9ce5-7232-83eb-f9a6679dee28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PolicyholderAccountBalanceTable_019cb454-9ce5-7fbe-9046-d4019948f5de" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis_019cb454-9ce5-7232-83eb-f9a6679dee28" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_019cb454-9ce5-7232-83eb-f9a6679dee28_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis_019cb454-9ce5-7232-83eb-f9a6679dee28" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_019cb454-9ce5-7232-83eb-f9a6679dee28_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_019cb454-9ce5-7038-ae89-f9b0007dd1a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateAxis_019cb454-9ce5-7232-83eb-f9a6679dee28" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_019cb454-9ce5-7038-ae89-f9b0007dd1a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMember_019cb454-9ce5-7193-9735-c5d95900751b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_019cb454-9ce5-7038-ae89-f9b0007dd1a1" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAtGuaranteedMinimumCreditingRateMember_019cb454-9ce5-7193-9735-c5d95900751b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0050Member_019cb454-9ce5-713e-8ed5-5d7e806fb53a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0050Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_019cb454-9ce5-7038-ae89-f9b0007dd1a1" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0001To0050Member_019cb454-9ce5-713e-8ed5-5d7e806fb53a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0150Member_019cb454-9ce5-7e55-a8f6-b5aae32eb59e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0150Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_019cb454-9ce5-7038-ae89-f9b0007dd1a1" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0150Member_019cb454-9ce5-7e55-a8f6-b5aae32eb59e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateGreaterThan0150Member_019cb454-9ce5-72c8-800b-48c9bb3b5781" xlink:href="fg-20260331.xsd#fg_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateGreaterThan0150Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateDomain_019cb454-9ce5-7038-ae89-f9b0007dd1a1" xlink:to="loc_fg_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateGreaterThan0150Member_019cb454-9ce5-72c8-800b-48c9bb3b5781" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019cb454-9ce5-7634-87c4-81ea6eda078b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_PolicyholderAccountBalanceTable_019cb454-9ce5-7fbe-9046-d4019948f5de" xlink:to="loc_srt_RangeAxis_019cb454-9ce5-7634-87c4-81ea6eda078b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cb454-9ce5-7634-87c4-81ea6eda078b_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019cb454-9ce5-7634-87c4-81ea6eda078b" xlink:to="loc_srt_RangeMember_019cb454-9ce5-7634-87c4-81ea6eda078b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cb454-9ce5-796a-8935-2922acbbbc90" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019cb454-9ce5-7634-87c4-81ea6eda078b" xlink:to="loc_srt_RangeMember_019cb454-9ce5-796a-8935-2922acbbbc90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019cb454-9ce5-7b46-b11e-380c4e49ad51" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019cb454-9ce5-796a-8935-2922acbbbc90" xlink:to="loc_srt_MinimumMember_019cb454-9ce5-7b46-b11e-380c4e49ad51" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019cb454-9ce5-7223-872e-1e9a8464bc6b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019cb454-9ce5-796a-8935-2922acbbbc90" xlink:to="loc_srt_MaximumMember_019cb454-9ce5-7223-872e-1e9a8464bc6b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRate_019cb454-9ce5-79b6-9e02-c1551d883b98" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019cb454-9ce5-7a50-964d-7cee4095d9ca" xlink:to="loc_us-gaap_PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRate_019cb454-9ce5-79b6-9e02-c1551d883b98" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderFunds_019cb454-9ce5-7f15-b5af-9741e76497ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019cb454-9ce5-7a50-964d-7cee4095d9ca" xlink:to="loc_us-gaap_PolicyholderFunds_019cb454-9ce5-7f15-b5af-9741e76497ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PolicyholderAccountBalanceWithNoGuaranteedMinimumCreditingRate_019cb454-9ce5-7c46-b4f8-9d93e8847d02" xlink:href="fg-20260331.xsd#fg_PolicyholderAccountBalanceWithNoGuaranteedMinimumCreditingRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019cb454-9ce5-7a50-964d-7cee4095d9ca" xlink:to="loc_fg_PolicyholderAccountBalanceWithNoGuaranteedMinimumCreditingRate_019cb454-9ce5-7c46-b4f8-9d93e8847d02" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_019cb454-9ce5-70a9-83f1-ea68ec762613" xlink:href="fg-20260331.xsd#fg_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PolicyholderAccountBalanceLineItems_019cb454-9ce5-7a50-964d-7cee4095d9ca" xlink:to="loc_fg_PolicyholderAccountBalanceIncludingCustomersWithNoGuaranteedCreditRating_019cb454-9ce5-70a9-83f1-ea68ec762613" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/FuturePolicyBenefitsSummaryBalancesandChangesinthePresentValueofExpectedNetPremiumsandPresentValueofFPBDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#FuturePolicyBenefitsSummaryBalancesandChangesinthePresentValueofExpectedNetPremiumsandPresentValueofFPBDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/FuturePolicyBenefitsSummaryBalancesandChangesinthePresentValueofExpectedNetPremiumsandPresentValueofFPBDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-787d-ab86-9c253b49cda6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019cb454-9ce5-78b2-9ec0-7b51aaafb7a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-787d-ab86-9c253b49cda6" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019cb454-9ce5-78b2-9ec0-7b51aaafb7a5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb454-9ce5-70c9-aa4a-00fdf5cdcd17" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019cb454-9ce5-78b2-9ec0-7b51aaafb7a5" xlink:to="loc_srt_ProductOrServiceAxis_019cb454-9ce5-70c9-aa4a-00fdf5cdcd17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-70c9-aa4a-00fdf5cdcd17_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9ce5-70c9-aa4a-00fdf5cdcd17" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-70c9-aa4a-00fdf5cdcd17_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7888-8d6f-5c1ce2dbc4d0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9ce5-70c9-aa4a-00fdf5cdcd17" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7888-8d6f-5c1ce2dbc4d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_TraditionalLifeInsuranceMember_019cb454-9ce5-7e6a-8e32-967713d4cabb" xlink:href="fg-20260331.xsd#fg_TraditionalLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7888-8d6f-5c1ce2dbc4d0" xlink:to="loc_fg_TraditionalLifeInsuranceMember_019cb454-9ce5-7e6a-8e32-967713d4cabb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PensionRiskTransfersMember_019cb454-9ce5-766a-b810-6ed2583cbf9d" xlink:href="fg-20260331.xsd#fg_PensionRiskTransfersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7888-8d6f-5c1ce2dbc4d0" xlink:to="loc_fg_PensionRiskTransfersMember_019cb454-9ce5-766a-b810-6ed2583cbf9d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ImmediateAnnuityMember_019cb454-9ce5-791f-9c73-23113b99d95b" xlink:href="fg-20260331.xsd#fg_ImmediateAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7888-8d6f-5c1ce2dbc4d0" xlink:to="loc_fg_ImmediateAnnuityMember_019cb454-9ce5-791f-9c73-23113b99d95b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019cb454-9ce5-7cca-b958-ec462556bfbb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-787d-ab86-9c253b49cda6" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019cb454-9ce5-7cca-b958-ec462556bfbb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange_019cb454-9ce5-75b7-b1a8-aa0bd8810f40" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019cb454-9ce5-7cca-b958-ec462556bfbb" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange_019cb454-9ce5-75b7-b1a8-aa0bd8810f40" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance_019cb454-9ce5-77bc-9ea2-c6f64d106f65" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019cb454-9ce5-7cca-b958-ec462556bfbb" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance_019cb454-9ce5-77bc-9ea2-c6f64d106f65" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience_019cb454-9ce5-7b1a-9210-93ab1c2b1b92" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance_019cb454-9ce5-77bc-9ea2-c6f64d106f65" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience_019cb454-9ce5-7b1a-9210-93ab1c2b1b92" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019cb454-9ce5-7ab7-bdcc-810fddba3d5f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019cb454-9ce5-7cca-b958-ec462556bfbb" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019cb454-9ce5-7ab7-bdcc-810fddba3d5f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumInterestIncome_019cb454-9ce5-75d3-bc28-a45a701c72f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumInterestIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019cb454-9ce5-7ab7-bdcc-810fddba3d5f" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumInterestIncome_019cb454-9ce5-75d3-bc28-a45a701c72f5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumNetPremiumCollected_019cb454-9ce5-72b5-bfca-3dfd796f392f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumNetPremiumCollected"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019cb454-9ce5-7ab7-bdcc-810fddba3d5f" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumNetPremiumCollected_019cb454-9ce5-72b5-bfca-3dfd796f392f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance_019cb454-9ce5-79a8-8654-f49c4c34da8a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumOriginalDiscountRateBeforeCashFlowAndReinsurance"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociLiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeTax_019cb454-9ce5-7d10-84c7-de2dda8c1b0d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociLiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumRollForward_019cb454-9ce5-7cca-b958-ec462556bfbb" xlink:to="loc_us-gaap_AociLiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeTax_019cb454-9ce5-7d10-84c7-de2dda8c1b0d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange_019cb454-9ce5-7e17-a329-acfc18ebba84" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedNetPremiumBeforeReinsuranceAfterDiscountRateChange"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019cb454-9ce5-7b99-bc18-1798fe83b4b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-787d-ab86-9c253b49cda6" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019cb454-9ce5-7b99-bc18-1798fe83b4b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange_019cb454-9ce5-70f7-a3ba-902b0a3a7f3f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019cb454-9ce5-7b99-bc18-1798fe83b4b5" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange_019cb454-9ce5-70f7-a3ba-902b0a3a7f3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance_019cb454-9ce5-70fe-85c8-807fc8c0e247" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019cb454-9ce5-7b99-bc18-1798fe83b4b5" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance_019cb454-9ce5-70fe-85c8-807fc8c0e247" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseFromCashFlowChange_019cb454-9ce5-752a-8ed2-32c310f13189" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseFromCashFlowChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance_019cb454-9ce5-70fe-85c8-807fc8c0e247" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseFromCashFlowChange_019cb454-9ce5-752a-8ed2-32c310f13189" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience_019cb454-9ce5-77dd-85dc-aab1ac278d94" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance_019cb454-9ce5-70fe-85c8-807fc8c0e247" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience_019cb454-9ce5-77dd-85dc-aab1ac278d94" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureBenefitOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019cb454-9ce5-7481-a4f3-3050e20bd89f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureBenefitOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance_019cb454-9ce5-70fe-85c8-807fc8c0e247" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureBenefitOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019cb454-9ce5-7481-a4f3-3050e20bd89f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitIssuance_019cb454-9ce5-728e-ba3b-10ac0b45f74c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureBenefitOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019cb454-9ce5-7481-a4f3-3050e20bd89f" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitIssuance_019cb454-9ce5-728e-ba3b-10ac0b45f74c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitInterestExpense_019cb454-9ce5-7601-a849-c2fd9d2886ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureBenefitOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019cb454-9ce5-7481-a4f3-3050e20bd89f" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitInterestExpense_019cb454-9ce5-7601-a849-c2fd9d2886ac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitsPaymentForBenefits_019cb454-9ce5-7fe8-b12b-391a4960968b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitsPaymentForBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureBenefitOriginalDiscountRateBeforeReinsuranceAfterCashFlowChange_019cb454-9ce5-7481-a4f3-3050e20bd89f" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitsPaymentForBenefits_019cb454-9ce5-7fe8-b12b-391a4960968b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance_019cb454-9ce5-78d0-8575-edf504c800e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitOriginalDiscountRateBeforeCashFlowAndReinsurance"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AociLiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTax_019cb454-9ce5-7f9a-a797-9aabdda37f89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AociLiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019cb454-9ce5-7b99-bc18-1798fe83b4b5" xlink:to="loc_us-gaap_AociLiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeTax_019cb454-9ce5-7f9a-a797-9aabdda37f89" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange_019cb454-9ce5-725b-8b20-9e57cb1405bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefits_019cb454-9ce5-78c4-bcfb-7db3e4386f2d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019cb454-9ce5-7b99-bc18-1798fe83b4b5" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefits_019cb454-9ce5-78c4-bcfb-7db3e4386f2d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitReinsuranceRecoverableAfterAllowance_019cb454-9ce5-7dc1-8dbf-fc073ec46a87" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitReinsuranceRecoverableAfterAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019cb454-9ce5-7b99-bc18-1798fe83b4b5" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitReinsuranceRecoverableAfterAllowance_019cb454-9ce5-7dc1-8dbf-fc073ec46a87" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitAfterReinsurance_019cb454-9ce5-7f9e-b562-cf478246a09d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitAfterReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019cb454-9ce5-7b99-bc18-1798fe83b4b5" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitAfterReinsurance_019cb454-9ce5-7f9e-b562-cf478246a09d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageDuration_019cb454-9ce5-7f51-950b-a354907d1d09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageDuration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitRollForward_019cb454-9ce5-7b99-bc18-1798fe83b4b5" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageDuration_019cb454-9ce5-7f51-950b-a354907d1d09" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/FuturePolicyBenefitsSummaryofBalancesandChangesintheDeferredProfitLiabilityDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#FuturePolicyBenefitsSummaryofBalancesandChangesintheDeferredProfitLiabilityDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/FuturePolicyBenefitsSummaryofBalancesandChangesintheDeferredProfitLiabilityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-78d4-91d5-3dd04170b2ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019cb454-9ce5-77d6-b281-7f4e89c535e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-78d4-91d5-3dd04170b2ae" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019cb454-9ce5-77d6-b281-7f4e89c535e3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7c92-8309-0dc170389c1b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019cb454-9ce5-77d6-b281-7f4e89c535e3" xlink:to="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7c92-8309-0dc170389c1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7c92-8309-0dc170389c1b_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7c92-8309-0dc170389c1b" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7c92-8309-0dc170389c1b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7a7c-ba9a-a24a3bf8c4e2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7c92-8309-0dc170389c1b" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7a7c-ba9a-a24a3bf8c4e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ImmediateAnnuityMember_019cb454-9ce5-7308-ab89-8507de80a331" xlink:href="fg-20260331.xsd#fg_ImmediateAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7a7c-ba9a-a24a3bf8c4e2" xlink:to="loc_fg_ImmediateAnnuityMember_019cb454-9ce5-7308-ab89-8507de80a331" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PensionRiskTransfersMember_019cb454-9ce5-752c-abc4-386729c5d2aa" xlink:href="fg-20260331.xsd#fg_PensionRiskTransfersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7a7c-ba9a-a24a3bf8c4e2" xlink:to="loc_fg_PensionRiskTransfersMember_019cb454-9ce5-752c-abc4-386729c5d2aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DeferredProfitLiabilityActivityRollForward_019cb454-9ce5-71a9-af04-e27d03213fde" xlink:href="fg-20260331.xsd#fg_DeferredProfitLiabilityActivityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-78d4-91d5-3dd04170b2ae" xlink:to="loc_fg_DeferredProfitLiabilityActivityRollForward_019cb454-9ce5-71a9-af04-e27d03213fde" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DeferredProfitLiability_019cb454-9ce5-7ee4-bce4-c7214022856b" xlink:href="fg-20260331.xsd#fg_DeferredProfitLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_DeferredProfitLiabilityActivityRollForward_019cb454-9ce5-71a9-af04-e27d03213fde" xlink:to="loc_fg_DeferredProfitLiability_019cb454-9ce5-7ee4-bce4-c7214022856b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DeferredProfitLiabilityCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience_019cb454-9ce5-73b9-98fd-8c0eea3397ae" xlink:href="fg-20260331.xsd#fg_DeferredProfitLiabilityCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_DeferredProfitLiability_019cb454-9ce5-7ee4-bce4-c7214022856b" xlink:to="loc_fg_DeferredProfitLiabilityCumulativeIncreaseDecreaseOfActualVarianceFromExpectedExperience_019cb454-9ce5-73b9-98fd-8c0eea3397ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DeferredProfitLiabilityBeforeReinsuranceAfterCashFlowChange_019cb454-9ce5-7ada-a831-211133858565" xlink:href="fg-20260331.xsd#fg_DeferredProfitLiabilityBeforeReinsuranceAfterCashFlowChange"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_DeferredProfitLiabilityActivityRollForward_019cb454-9ce5-71a9-af04-e27d03213fde" xlink:to="loc_fg_DeferredProfitLiabilityBeforeReinsuranceAfterCashFlowChange_019cb454-9ce5-7ada-a831-211133858565" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DeferredProfitLiabilityIssuance_019cb454-9ce5-7635-9aaa-fc4b1a25402e" xlink:href="fg-20260331.xsd#fg_DeferredProfitLiabilityIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_DeferredProfitLiabilityBeforeReinsuranceAfterCashFlowChange_019cb454-9ce5-7ada-a831-211133858565" xlink:to="loc_fg_DeferredProfitLiabilityIssuance_019cb454-9ce5-7635-9aaa-fc4b1a25402e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DeferredProfitLiabilityInterestExpense_019cb454-9ce5-713f-848c-d4f93a39b0f3" xlink:href="fg-20260331.xsd#fg_DeferredProfitLiabilityInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_DeferredProfitLiabilityBeforeReinsuranceAfterCashFlowChange_019cb454-9ce5-7ada-a831-211133858565" xlink:to="loc_fg_DeferredProfitLiabilityInterestExpense_019cb454-9ce5-713f-848c-d4f93a39b0f3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DeferredProfitLiabilityAmortization_019cb454-9ce5-7a6c-a83e-78fe6bd3fca3" xlink:href="fg-20260331.xsd#fg_DeferredProfitLiabilityAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_DeferredProfitLiabilityBeforeReinsuranceAfterCashFlowChange_019cb454-9ce5-7ada-a831-211133858565" xlink:to="loc_fg_DeferredProfitLiabilityAmortization_019cb454-9ce5-7a6c-a83e-78fe6bd3fca3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DeferredProfitLiability_019cb454-9ce5-7ccb-82fe-0f0e9d74b6b6" xlink:href="fg-20260331.xsd#fg_DeferredProfitLiability"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/FuturePolicyBenefitsReconciliationofNetFPBtotheCondensedConsolidatedBalanceSheetsDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#FuturePolicyBenefitsReconciliationofNetFPBtotheCondensedConsolidatedBalanceSheetsDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/FuturePolicyBenefitsReconciliationofNetFPBtotheCondensedConsolidatedBalanceSheetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-70dd-8a7b-e76f2cea2509" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019cb454-9ce5-7a6a-8c5c-e83157a25d73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-70dd-8a7b-e76f2cea2509" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019cb454-9ce5-7a6a-8c5c-e83157a25d73" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7d6b-b153-e4422667688c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019cb454-9ce5-7a6a-8c5c-e83157a25d73" xlink:to="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7d6b-b153-e4422667688c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7d6b-b153-e4422667688c_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7d6b-b153-e4422667688c" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7d6b-b153-e4422667688c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7e37-8590-9a20bea740ef" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7d6b-b153-e4422667688c" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7e37-8590-9a20bea740ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_TraditionalLifeInsuranceMember_019cb454-9ce5-7c2c-b0b9-598fbf9f676a" xlink:href="fg-20260331.xsd#fg_TraditionalLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7e37-8590-9a20bea740ef" xlink:to="loc_fg_TraditionalLifeInsuranceMember_019cb454-9ce5-7c2c-b0b9-598fbf9f676a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ImmediateAnnuityMember_019cb454-9ce5-75e0-ba0d-b9cc706c5a9c" xlink:href="fg-20260331.xsd#fg_ImmediateAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7e37-8590-9a20bea740ef" xlink:to="loc_fg_ImmediateAnnuityMember_019cb454-9ce5-75e0-ba0d-b9cc706c5a9c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PRTMember_019cb454-9ce5-72e3-9b28-608ac3c52085" xlink:href="fg-20260331.xsd#fg_PRTMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7e37-8590-9a20bea740ef" xlink:to="loc_fg_PRTMember_019cb454-9ce5-72e3-9b28-608ac3c52085" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ImmediateAnnuityDeferredProfitLiabilityMember_019cb454-9ce5-7ba3-aa7d-870123bf88fd" xlink:href="fg-20260331.xsd#fg_ImmediateAnnuityDeferredProfitLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7e37-8590-9a20bea740ef" xlink:to="loc_fg_ImmediateAnnuityDeferredProfitLiabilityMember_019cb454-9ce5-7ba3-aa7d-870123bf88fd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PRTDeferredProfitLiabilityMember_019cb454-9ce5-785c-b893-95a35b23f24e" xlink:href="fg-20260331.xsd#fg_PRTDeferredProfitLiabilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7e37-8590-9a20bea740ef" xlink:to="loc_fg_PRTDeferredProfitLiabilityMember_019cb454-9ce5-785c-b893-95a35b23f24e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefits_019cb454-9ce5-7b48-a23d-964b1892f0c8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-70dd-8a7b-e76f2cea2509" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefits_019cb454-9ce5-7b48-a23d-964b1892f0c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DeferredProfitLiability_019cb454-9ce5-7a0b-86c6-4476a81c23ea" xlink:href="fg-20260331.xsd#fg_DeferredProfitLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-70dd-8a7b-e76f2cea2509" xlink:to="loc_fg_DeferredProfitLiability_019cb454-9ce5-7a0b-86c6-4476a81c23ea" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/FuturePolicyBenefitsLiabilityforFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#FuturePolicyBenefitsLiabilityforFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/FuturePolicyBenefitsLiabilityforFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-7971-a7d2-44d2c63bf326" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019cb454-9ce5-7c37-9ce8-9c8c57bc3ed6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-7971-a7d2-44d2c63bf326" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019cb454-9ce5-7c37-9ce8-9c8c57bc3ed6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7dd2-a9fb-9068e2c38857" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019cb454-9ce5-7c37-9ce8-9c8c57bc3ed6" xlink:to="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7dd2-a9fb-9068e2c38857" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7dd2-a9fb-9068e2c38857_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7dd2-a9fb-9068e2c38857" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7dd2-a9fb-9068e2c38857_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7da4-9ec4-4cdeb6f14e86" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7dd2-a9fb-9068e2c38857" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7da4-9ec4-4cdeb6f14e86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_TraditionalLifeInsuranceMember_019cb454-9ce5-79d4-9302-ad8dc3a76cc9" xlink:href="fg-20260331.xsd#fg_TraditionalLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7da4-9ec4-4cdeb6f14e86" xlink:to="loc_fg_TraditionalLifeInsuranceMember_019cb454-9ce5-79d4-9302-ad8dc3a76cc9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ImmediateAnnuityMember_019cb454-9ce5-7c96-8196-3caacf2c1257" xlink:href="fg-20260331.xsd#fg_ImmediateAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7da4-9ec4-4cdeb6f14e86" xlink:to="loc_fg_ImmediateAnnuityMember_019cb454-9ce5-7c96-8196-3caacf2c1257" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PRTMember_019cb454-9ce5-76f2-a342-64018fb69666" xlink:href="fg-20260331.xsd#fg_PRTMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7da4-9ec4-4cdeb6f14e86" xlink:to="loc_fg_PRTMember_019cb454-9ce5-76f2-a342-64018fb69666" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedAbstract_019cb454-9ce5-7dfa-8976-a762558fac4f" xlink:href="fg-20260331.xsd#fg_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-7971-a7d2-44d2c63bf326" xlink:to="loc_fg_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedAbstract_019cb454-9ce5-7dfa-8976-a762558fac4f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedBeforeReinsurance_019cb454-9ce5-7560-8fae-fe70f94b37a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedBeforeReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedAbstract_019cb454-9ce5-7dfa-8976-a762558fac4f" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedBeforeReinsurance_019cb454-9ce5-7560-8fae-fe70f94b37a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumUndiscountedBeforeReinsurance_019cb454-9ce5-7363-86f7-7ad203b61ae8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumUndiscountedBeforeReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedAbstract_019cb454-9ce5-7dfa-8976-a762558fac4f" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumUndiscountedBeforeReinsurance_019cb454-9ce5-7363-86f7-7ad203b61ae8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitDiscountedAbstract_019cb454-9ce5-7941-8da9-d22a6347757e" xlink:href="fg-20260331.xsd#fg_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitDiscountedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-7971-a7d2-44d2c63bf326" xlink:to="loc_fg_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitDiscountedAbstract_019cb454-9ce5-7941-8da9-d22a6347757e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitDiscountedBeforeReinsurance_019cb454-9ce5-7848-ae7b-c10311db7322" xlink:href="fg-20260331.xsd#fg_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitDiscountedBeforeReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitDiscountedAbstract_019cb454-9ce5-7941-8da9-d22a6347757e" xlink:to="loc_fg_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitDiscountedBeforeReinsurance_019cb454-9ce5-7848-ae7b-c10311db7322" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumDiscountedBeforeReinsurance_019cb454-9ce5-76df-ba22-bb0e428ef399" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumDiscountedBeforeReinsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitDiscountedAbstract_019cb454-9ce5-7941-8da9-d22a6347757e" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumDiscountedBeforeReinsurance_019cb454-9ce5-76df-ba22-bb0e428ef399" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/FuturePolicyBenefitsGrossPremiumIncomeandInterestExpenseDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#FuturePolicyBenefitsGrossPremiumIncomeandInterestExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/FuturePolicyBenefitsGrossPremiumIncomeandInterestExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-73b8-99a0-25eeb777256a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019cb454-9ce5-7723-b380-965dced66ff1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-73b8-99a0-25eeb777256a" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019cb454-9ce5-7723-b380-965dced66ff1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7906-afd3-5f32c27ee929" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019cb454-9ce5-7723-b380-965dced66ff1" xlink:to="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7906-afd3-5f32c27ee929" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7906-afd3-5f32c27ee929_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7906-afd3-5f32c27ee929" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7906-afd3-5f32c27ee929_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-72b1-96e2-d9c1fb9f5dc1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7906-afd3-5f32c27ee929" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-72b1-96e2-d9c1fb9f5dc1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_TraditionalLifeInsuranceMember_019cb454-9ce5-7318-b3b4-a9a431a4ad13" xlink:href="fg-20260331.xsd#fg_TraditionalLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-72b1-96e2-d9c1fb9f5dc1" xlink:to="loc_fg_TraditionalLifeInsuranceMember_019cb454-9ce5-7318-b3b4-a9a431a4ad13" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ImmediateAnnuityMember_019cb454-9ce5-7449-b162-07b472e8e814" xlink:href="fg-20260331.xsd#fg_ImmediateAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-72b1-96e2-d9c1fb9f5dc1" xlink:to="loc_fg_ImmediateAnnuityMember_019cb454-9ce5-7449-b162-07b472e8e814" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PRTMember_019cb454-9ce5-7d7d-ab67-06c3fe228aad" xlink:href="fg-20260331.xsd#fg_PRTMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-72b1-96e2-d9c1fb9f5dc1" xlink:to="loc_fg_PRTMember_019cb454-9ce5-7d7d-ab67-06c3fe228aad" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitGrossPremiumIncome_019cb454-9ce5-7e54-8645-831df49db963" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitGrossPremiumIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-73b8-99a0-25eeb777256a" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitGrossPremiumIncome_019cb454-9ce5-7e54-8645-831df49db963" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitInterestExpense_019cb454-9ce5-74aa-af80-61e55e1bfc3e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitInterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-73b8-99a0-25eeb777256a" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitInterestExpense_019cb454-9ce5-74aa-af80-61e55e1bfc3e" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/FuturePolicyBenefitsWeightedAverageRatesDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#FuturePolicyBenefitsWeightedAverageRatesDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/FuturePolicyBenefitsWeightedAverageRatesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-764d-9331-a00677e2180b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019cb454-9ce5-797a-8b69-4a217c93ca68" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-764d-9331-a00677e2180b" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019cb454-9ce5-797a-8b69-4a217c93ca68" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7aca-aba3-078fafbef3ce" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019cb454-9ce5-797a-8b69-4a217c93ca68" xlink:to="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7aca-aba3-078fafbef3ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7aca-aba3-078fafbef3ce_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7aca-aba3-078fafbef3ce" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7aca-aba3-078fafbef3ce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-78a1-9905-ae3e3001ee9a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7aca-aba3-078fafbef3ce" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-78a1-9905-ae3e3001ee9a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_TraditionalLifeInsuranceMember_019cb454-9ce5-799b-811c-312a0452882b" xlink:href="fg-20260331.xsd#fg_TraditionalLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-78a1-9905-ae3e3001ee9a" xlink:to="loc_fg_TraditionalLifeInsuranceMember_019cb454-9ce5-799b-811c-312a0452882b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ImmediateAnnuityMember_019cb454-9ce5-7ad5-a88d-6b6fc9e90157" xlink:href="fg-20260331.xsd#fg_ImmediateAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-78a1-9905-ae3e3001ee9a" xlink:to="loc_fg_ImmediateAnnuityMember_019cb454-9ce5-7ad5-a88d-6b6fc9e90157" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PensionRiskTransfersMember_019cb454-9ce5-72ff-9843-679f96fcf3cc" xlink:href="fg-20260331.xsd#fg_PensionRiskTransfersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-78a1-9905-ae3e3001ee9a" xlink:to="loc_fg_PensionRiskTransfersMember_019cb454-9ce5-72ff-9843-679f96fcf3cc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageInterestAccretionRate_019cb454-9ce5-702f-949a-135997648d7e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageInterestAccretionRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-764d-9331-a00677e2180b" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitWeightedAverageInterestAccretionRate_019cb454-9ce5-702f-949a-135997648d7e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitCurrentWeightedAverageDiscountRate_019cb454-9ce5-79ff-9f1b-f5dabe96e6f5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitCurrentWeightedAverageDiscountRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-764d-9331-a00677e2180b" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitCurrentWeightedAverageDiscountRate_019cb454-9ce5-79ff-9f1b-f5dabe96e6f5" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/FuturePolicyBenefitsActualExperienceandExpectedExperienceforMortalityandLapsesDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#FuturePolicyBenefitsActualExperienceandExpectedExperienceforMortalityandLapsesDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/FuturePolicyBenefitsActualExperienceandExpectedExperienceforMortalityandLapsesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-713e-8518-30300efb7088" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019cb454-9ce5-740f-ab29-fe432b2eca0c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilityForFuturePolicyBenefitActivityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-713e-8518-30300efb7088" xlink:to="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019cb454-9ce5-740f-ab29-fe432b2eca0c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_LongDurationContractsAssumptionsAxis_019cb454-9ce5-72b8-81c5-466c3d68adc4" xlink:href="fg-20260331.xsd#fg_LongDurationContractsAssumptionsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019cb454-9ce5-740f-ab29-fe432b2eca0c" xlink:to="loc_fg_LongDurationContractsAssumptionsAxis_019cb454-9ce5-72b8-81c5-466c3d68adc4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_LongDurationContractsAssumptionsDomain_019cb454-9ce5-72b8-81c5-466c3d68adc4_default" xlink:href="fg-20260331.xsd#fg_LongDurationContractsAssumptionsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_fg_LongDurationContractsAssumptionsAxis_019cb454-9ce5-72b8-81c5-466c3d68adc4" xlink:to="loc_fg_LongDurationContractsAssumptionsDomain_019cb454-9ce5-72b8-81c5-466c3d68adc4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_LongDurationContractsAssumptionsDomain_019cb454-9ce5-7332-b8cf-10167062f45a" xlink:href="fg-20260331.xsd#fg_LongDurationContractsAssumptionsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_fg_LongDurationContractsAssumptionsAxis_019cb454-9ce5-72b8-81c5-466c3d68adc4" xlink:to="loc_fg_LongDurationContractsAssumptionsDomain_019cb454-9ce5-7332-b8cf-10167062f45a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_LongDurationContractsAssumptionsActualExperienceMember_019cb454-9ce5-7e3d-bcd1-a963cbf56e12" xlink:href="fg-20260331.xsd#fg_LongDurationContractsAssumptionsActualExperienceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_LongDurationContractsAssumptionsDomain_019cb454-9ce5-7332-b8cf-10167062f45a" xlink:to="loc_fg_LongDurationContractsAssumptionsActualExperienceMember_019cb454-9ce5-7e3d-bcd1-a963cbf56e12" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_LongDurationContractsAssumptionsExpectedExperienceMember_019cb454-9ce5-7296-8f71-fc82f9184950" xlink:href="fg-20260331.xsd#fg_LongDurationContractsAssumptionsExpectedExperienceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_LongDurationContractsAssumptionsDomain_019cb454-9ce5-7332-b8cf-10167062f45a" xlink:to="loc_fg_LongDurationContractsAssumptionsExpectedExperienceMember_019cb454-9ce5-7296-8f71-fc82f9184950" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7040-ae34-7e221c1eba96" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityTable_019cb454-9ce5-740f-ab29-fe432b2eca0c" xlink:to="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7040-ae34-7e221c1eba96" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7040-ae34-7e221c1eba96_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7040-ae34-7e221c1eba96" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7040-ae34-7e221c1eba96_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-77d3-be6a-008286b30be8" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9ce5-7040-ae34-7e221c1eba96" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-77d3-be6a-008286b30be8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_TraditionalLifeInsuranceMember_019cb454-9ce5-7cdf-b961-d835f7f6a344" xlink:href="fg-20260331.xsd#fg_TraditionalLifeInsuranceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-77d3-be6a-008286b30be8" xlink:to="loc_fg_TraditionalLifeInsuranceMember_019cb454-9ce5-7cdf-b961-d835f7f6a344" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ImmediateAnnuityMember_019cb454-9ce5-7e43-b120-58f6f7ca899c" xlink:href="fg-20260331.xsd#fg_ImmediateAnnuityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-77d3-be6a-008286b30be8" xlink:to="loc_fg_ImmediateAnnuityMember_019cb454-9ce5-7e43-b120-58f6f7ca899c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PensionRiskTransfersMember_019cb454-9ce5-7b8c-8711-95bf960921ac" xlink:href="fg-20260331.xsd#fg_PensionRiskTransfersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-77d3-be6a-008286b30be8" xlink:to="loc_fg_PensionRiskTransfersMember_019cb454-9ce5-7b8c-8711-95bf960921ac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongDurationContractsAssumptionsByProductAndGuaranteeMortalityRate_019cb454-9ce5-724d-a457-f9672fa95258" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongDurationContractsAssumptionsByProductAndGuaranteeMortalityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-713e-8518-30300efb7088" xlink:to="loc_us-gaap_LongDurationContractsAssumptionsByProductAndGuaranteeMortalityRate_019cb454-9ce5-724d-a457-f9672fa95258" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongDurationContractsAssumptionsByProductAndGuaranteeLapseRate_019cb454-9ce5-722b-8b1b-26f54375d790" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongDurationContractsAssumptionsByProductAndGuaranteeLapseRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForFuturePolicyBenefitActivityLineItems_019cb454-9ce5-713e-8518-30300efb7088" xlink:to="loc_us-gaap_LongDurationContractsAssumptionsByProductAndGuaranteeLapseRate_019cb454-9ce5-722b-8b1b-26f54375d790" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/AccountsPayableandAccruedLiabilitiesRollforwardofUnearnedRevenueLiabilitiesURLDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#AccountsPayableandAccruedLiabilitiesRollforwardofUnearnedRevenueLiabilitiesURLDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/AccountsPayableandAccruedLiabilitiesRollforwardofUnearnedRevenueLiabilitiesURLDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_019cb454-9ce5-77c4-81df-306b991189b8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_019cb454-9ce5-7302-a76a-e412f0c5addd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019cb454-9ce5-77c4-81df-306b991189b8" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_019cb454-9ce5-7302-a76a-e412f0c5addd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_019cb454-9ce5-788f-ab43-ba48fb883f4b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_019cb454-9ce5-7302-a76a-e412f0c5addd" xlink:to="loc_srt_ProductOrServiceAxis_019cb454-9ce5-788f-ab43-ba48fb883f4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-788f-ab43-ba48fb883f4b_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9ce5-788f-ab43-ba48fb883f4b" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-788f-ab43-ba48fb883f4b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7fe7-ad0f-777eabacf52f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_019cb454-9ce5-788f-ab43-ba48fb883f4b" xlink:to="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7fe7-ad0f-777eabacf52f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UniversalLifeMember_019cb454-9ce5-728f-bc57-0d8e3d4eaf6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UniversalLifeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_019cb454-9ce5-7fe7-ad0f-777eabacf52f" xlink:to="loc_us-gaap_UniversalLifeMember_019cb454-9ce5-728f-bc57-0d8e3d4eaf6c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ContractWithCustomerLiabilityRollForward_019cb454-9ce5-7ded-a16e-98484e15aab3" xlink:href="fg-20260331.xsd#fg_ContractWithCustomerLiabilityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_019cb454-9ce5-77c4-81df-306b991189b8" xlink:to="loc_fg_ContractWithCustomerLiabilityRollForward_019cb454-9ce5-7ded-a16e-98484e15aab3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_019cb454-9ce5-71ab-ab0a-f09ac36a9fb4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_ContractWithCustomerLiabilityRollForward_019cb454-9ce5-7ded-a16e-98484e15aab3" xlink:to="loc_us-gaap_ContractWithCustomerLiability_019cb454-9ce5-71ab-ab0a-f09ac36a9fb4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ContractWithCustomerLiabilityAdditions_019cb454-9ce5-7e2a-8aaa-fb87cc49362c" xlink:href="fg-20260331.xsd#fg_ContractWithCustomerLiabilityAdditions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_ContractWithCustomerLiabilityRollForward_019cb454-9ce5-7ded-a16e-98484e15aab3" xlink:to="loc_fg_ContractWithCustomerLiabilityAdditions_019cb454-9ce5-7e2a-8aaa-fb87cc49362c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ContractWithCustomerAmortization_019cb454-9ce5-7240-a113-be5361f031e6" xlink:href="fg-20260331.xsd#fg_ContractWithCustomerAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_ContractWithCustomerLiabilityRollForward_019cb454-9ce5-7ded-a16e-98484e15aab3" xlink:to="loc_fg_ContractWithCustomerAmortization_019cb454-9ce5-7240-a113-be5361f031e6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiability_019cb454-9ce5-75da-964e-5c77ef7eab65" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ContractWithCustomerLiability"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/NotesPayableComponentsofNotesPayableDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#NotesPayableComponentsofNotesPayableDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/NotesPayableComponentsofNotesPayableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019cb454-9ce5-794a-a5bb-46283e4afd85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019cb454-9ce5-72d0-a3d5-a9fd8c14ca22" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9ce5-794a-a5bb-46283e4afd85" xlink:to="loc_us-gaap_DebtInstrumentTable_019cb454-9ce5-72d0-a3d5-a9fd8c14ca22" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019cb454-9ce5-7a1b-b5ea-d5bd46b0fa06" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cb454-9ce5-72d0-a3d5-a9fd8c14ca22" xlink:to="loc_us-gaap_DebtInstrumentAxis_019cb454-9ce5-7a1b-b5ea-d5bd46b0fa06" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019cb454-9ce5-7a1b-b5ea-d5bd46b0fa06_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019cb454-9ce5-7a1b-b5ea-d5bd46b0fa06" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019cb454-9ce5-7a1b-b5ea-d5bd46b0fa06_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019cb454-9ce5-7197-baf0-cf5e68253192" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019cb454-9ce5-7a1b-b5ea-d5bd46b0fa06" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019cb454-9ce5-7197-baf0-cf5e68253192" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_RevolvingCreditFacilityShortTermMember_019d48fd-10d2-7b8a-b88a-ef7d76e742cd" xlink:href="fg-20260331.xsd#fg_RevolvingCreditFacilityShortTermMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019cb454-9ce5-7197-baf0-cf5e68253192" xlink:to="loc_fg_RevolvingCreditFacilityShortTermMember_019d48fd-10d2-7b8a-b88a-ef7d76e742cd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FNFCreditFacilityShortTermMember_019d48fd-3a82-76ea-9674-c13329dfbae9" xlink:href="fg-20260331.xsd#fg_FNFCreditFacilityShortTermMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019cb454-9ce5-7197-baf0-cf5e68253192" xlink:to="loc_fg_FNFCreditFacilityShortTermMember_019d48fd-3a82-76ea-9674-c13329dfbae9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_A740SeniorNotesDue2028Member_019cb454-9ce5-7698-8f96-79870bff9965" xlink:href="fg-20260331.xsd#fg_A740SeniorNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019cb454-9ce5-7197-baf0-cf5e68253192" xlink:to="loc_fg_A740SeniorNotesDue2028Member_019cb454-9ce5-7698-8f96-79870bff9965" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_A6.50SeniorNotesDue2029Member_019cb454-9ce5-7d01-8ec3-09e6dfc063a3" xlink:href="fg-20260331.xsd#fg_A6.50SeniorNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019cb454-9ce5-7197-baf0-cf5e68253192" xlink:to="loc_fg_A6.50SeniorNotesDue2029Member_019cb454-9ce5-7d01-8ec3-09e6dfc063a3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_A6.250SeniorNotesDue2034Member_019cb454-9ce5-7d54-8aa5-7ff85bcb9c04" xlink:href="fg-20260331.xsd#fg_A6.250SeniorNotesDue2034Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019cb454-9ce5-7197-baf0-cf5e68253192" xlink:to="loc_fg_A6.250SeniorNotesDue2034Member_019cb454-9ce5-7d54-8aa5-7ff85bcb9c04" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_A7.950SeniorNotesDue2053Member_019cb454-9ce5-7242-8203-091307ba61f0" xlink:href="fg-20260331.xsd#fg_A7.950SeniorNotesDue2053Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019cb454-9ce5-7197-baf0-cf5e68253192" xlink:to="loc_fg_A7.950SeniorNotesDue2053Member_019cb454-9ce5-7242-8203-091307ba61f0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_A7.300JuniorSubordinatedNotesDue2065Member_019cb454-9ce5-7fbd-be9b-b70b660bda94" xlink:href="fg-20260331.xsd#fg_A7.300JuniorSubordinatedNotesDue2065Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019cb454-9ce5-7197-baf0-cf5e68253192" xlink:to="loc_fg_A7.300JuniorSubordinatedNotesDue2065Member_019cb454-9ce5-7fbd-be9b-b70b660bda94" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019cb454-9ce5-78b5-9e19-d10635ebcbf0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cb454-9ce5-72d0-a3d5-a9fd8c14ca22" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019cb454-9ce5-78b5-9e19-d10635ebcbf0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019cb454-9ce5-78b5-9e19-d10635ebcbf0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019cb454-9ce5-78b5-9e19-d10635ebcbf0" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019cb454-9ce5-78b5-9e19-d10635ebcbf0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019cb454-9ce5-757f-b907-d7bd2566e6b4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019cb454-9ce5-78b5-9e19-d10635ebcbf0" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019cb454-9ce5-757f-b907-d7bd2566e6b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_019cb454-9ce5-7df2-9bda-dba4b813db64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019cb454-9ce5-757f-b907-d7bd2566e6b4" xlink:to="loc_us-gaap_SeniorNotesMember_019cb454-9ce5-7df2-9bda-dba4b813db64" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019d48fd-10d2-7dd1-996d-e894c82e3dd5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019cb454-9ce5-757f-b907-d7bd2566e6b4" xlink:to="loc_us-gaap_LineOfCreditMember_019d48fd-10d2-7dd1-996d-e894c82e3dd5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019d48fd-10d2-755b-a005-7bcab96b14a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cb454-9ce5-72d0-a3d5-a9fd8c14ca22" xlink:to="loc_us-gaap_CreditFacilityAxis_019d48fd-10d2-755b-a005-7bcab96b14a7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019d48fd-10d2-755b-a005-7bcab96b14a7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019d48fd-10d2-755b-a005-7bcab96b14a7" xlink:to="loc_us-gaap_CreditFacilityDomain_019d48fd-10d2-755b-a005-7bcab96b14a7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019d48fd-10d2-788e-87cc-0d7ce3d63b22" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019d48fd-10d2-755b-a005-7bcab96b14a7" xlink:to="loc_us-gaap_CreditFacilityDomain_019d48fd-10d2-788e-87cc-0d7ce3d63b22" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019d48fd-10d2-7a5e-aa36-045e510c4717" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019d48fd-10d2-788e-87cc-0d7ce3d63b22" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019d48fd-10d2-7a5e-aa36-045e510c4717" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019cb454-9ce5-7579-bbe1-8bac5d9c041e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9ce5-794a-a5bb-46283e4afd85" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019cb454-9ce5-7579-bbe1-8bac5d9c041e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_019d48f8-d300-79a4-b4f3-b45d4d92410c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9ce5-794a-a5bb-46283e4afd85" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_019d48f8-d300-79a4-b4f3-b45d4d92410c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_019cb454-9ce5-72ea-ac1c-6e423e0529f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9ce5-794a-a5bb-46283e4afd85" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_019cb454-9ce5-72ea-ac1c-6e423e0529f1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_019cb454-9ce5-799b-b3ad-84a46394a3fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9ce5-794a-a5bb-46283e4afd85" xlink:to="loc_us-gaap_LongTermDebt_019cb454-9ce5-799b-b3ad-84a46394a3fd" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/NotesPayableNarrativeDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#NotesPayableNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/NotesPayableNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019cb454-9ce5-7377-b635-52f383217038" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019cb454-9ce5-7193-973e-28846448463f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9ce5-7377-b635-52f383217038" xlink:to="loc_us-gaap_DebtInstrumentTable_019cb454-9ce5-7193-973e-28846448463f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019d4908-164f-78de-966a-89a06df7e1bf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cb454-9ce5-7193-973e-28846448463f" xlink:to="loc_us-gaap_CreditFacilityAxis_019d4908-164f-78de-966a-89a06df7e1bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019d4908-164f-78de-966a-89a06df7e1bf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019d4908-164f-78de-966a-89a06df7e1bf" xlink:to="loc_us-gaap_CreditFacilityDomain_019d4908-164f-78de-966a-89a06df7e1bf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019d4908-164f-7909-ab86-4a400e3237f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019d4908-164f-78de-966a-89a06df7e1bf" xlink:to="loc_us-gaap_CreditFacilityDomain_019d4908-164f-7909-ab86-4a400e3237f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019d4908-164f-74ed-8046-05f14078c6b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019d4908-164f-7909-ab86-4a400e3237f2" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019d4908-164f-74ed-8046-05f14078c6b9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019d4908-164f-78db-9d4f-d131aece0248" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cb454-9ce5-7193-973e-28846448463f" xlink:to="loc_us-gaap_DebtInstrumentAxis_019d4908-164f-78db-9d4f-d131aece0248" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019d4908-164f-78db-9d4f-d131aece0248_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019d4908-164f-78db-9d4f-d131aece0248" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019d4908-164f-78db-9d4f-d131aece0248_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019d4908-164f-7f25-bfc7-427a80a3a4c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019d4908-164f-78db-9d4f-d131aece0248" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019d4908-164f-7f25-bfc7-427a80a3a4c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_CreditAgreementNovember2022Member_019d4908-164f-7447-83eb-3237b22e8f2d" xlink:href="fg-20260331.xsd#fg_CreditAgreementNovember2022Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019d4908-164f-7f25-bfc7-427a80a3a4c6" xlink:to="loc_fg_CreditAgreementNovember2022Member_019d4908-164f-7447-83eb-3237b22e8f2d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FNFCreditFacilityMember_019d4908-164f-7b5a-a114-181bfd86f25b" xlink:href="fg-20260331.xsd#fg_FNFCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019d4908-164f-7f25-bfc7-427a80a3a4c6" xlink:to="loc_fg_FNFCreditFacilityMember_019d4908-164f-7b5a-a114-181bfd86f25b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_A740SeniorNotesDue2028Member_019d4908-164f-7be1-a86b-95e3e4c70aa9" xlink:href="fg-20260331.xsd#fg_A740SeniorNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019d4908-164f-7f25-bfc7-427a80a3a4c6" xlink:to="loc_fg_A740SeniorNotesDue2028Member_019d4908-164f-7be1-a86b-95e3e4c70aa9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_A6.50SeniorNotesDue2029Member_019d4908-164f-76e6-99b6-afce625df9ad" xlink:href="fg-20260331.xsd#fg_A6.50SeniorNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019d4908-164f-7f25-bfc7-427a80a3a4c6" xlink:to="loc_fg_A6.50SeniorNotesDue2029Member_019d4908-164f-76e6-99b6-afce625df9ad" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_A6.250FGSeniorNotesMember_019d4908-164f-75cd-8f11-42493c48a92b" xlink:href="fg-20260331.xsd#fg_A6.250FGSeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019d4908-164f-7f25-bfc7-427a80a3a4c6" xlink:to="loc_fg_A6.250FGSeniorNotesMember_019d4908-164f-75cd-8f11-42493c48a92b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_A7.950SeniorNotesDue2053Member_019d4908-164f-70ad-82fb-181005efd8ae" xlink:href="fg-20260331.xsd#fg_A7.950SeniorNotesDue2053Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019d4908-164f-7f25-bfc7-427a80a3a4c6" xlink:to="loc_fg_A7.950SeniorNotesDue2053Member_019d4908-164f-70ad-82fb-181005efd8ae" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_A7.300JuniorSubordinatedNotesDue2065Member_019d4908-164f-76f8-a9f9-c84a5b55ade1" xlink:href="fg-20260331.xsd#fg_A7.300JuniorSubordinatedNotesDue2065Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019d4908-164f-7f25-bfc7-427a80a3a4c6" xlink:to="loc_fg_A7.300JuniorSubordinatedNotesDue2065Member_019d4908-164f-76f8-a9f9-c84a5b55ade1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019d4908-164f-70a9-8ea7-b116efb8703b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cb454-9ce5-7193-973e-28846448463f" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019d4908-164f-70a9-8ea7-b116efb8703b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019d4908-164f-70a9-8ea7-b116efb8703b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019d4908-164f-70a9-8ea7-b116efb8703b" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019d4908-164f-70a9-8ea7-b116efb8703b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019d4908-164f-78ad-8944-5a42d31e0850" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019d4908-164f-70a9-8ea7-b116efb8703b" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019d4908-164f-78ad-8944-5a42d31e0850" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019d4908-164f-7970-8ba1-6aa6cfde0c2f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019d4908-164f-78ad-8944-5a42d31e0850" xlink:to="loc_us-gaap_LineOfCreditMember_019d4908-164f-7970-8ba1-6aa6cfde0c2f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_019d4908-164f-7def-88b6-610e35727358" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019d4908-164f-78ad-8944-5a42d31e0850" xlink:to="loc_us-gaap_SeniorNotesMember_019d4908-164f-7def-88b6-610e35727358" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019d4908-164f-7896-8d6c-c38956869f11" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9ce5-7377-b635-52f383217038" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_019d4908-164f-7896-8d6c-c38956869f11" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019d4908-164f-7fb2-b42b-79b398edda28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9ce5-7377-b635-52f383217038" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019d4908-164f-7fb2-b42b-79b398edda28" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/NotesPayableInterestExpenseDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#NotesPayableInterestExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/NotesPayableInterestExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_019cb454-9ce5-7f16-9c9a-5e91b7e4873d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_019cb454-9ce5-76d1-970b-b00ecf5965d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9ce5-7f16-9c9a-5e91b7e4873d" xlink:to="loc_us-gaap_DebtInstrumentTable_019cb454-9ce5-76d1-970b-b00ecf5965d7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_019cb454-9ce5-7344-a994-502e321849ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cb454-9ce5-76d1-970b-b00ecf5965d7" xlink:to="loc_us-gaap_DebtInstrumentAxis_019cb454-9ce5-7344-a994-502e321849ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019cb454-9ce5-7344-a994-502e321849ae_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_019cb454-9ce5-7344-a994-502e321849ae" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019cb454-9ce5-7344-a994-502e321849ae_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_019cb454-9ce5-74bd-8259-59bae5eb4201" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_019cb454-9ce5-7344-a994-502e321849ae" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_019cb454-9ce5-74bd-8259-59bae5eb4201" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_CreditAgreementNovember2022Member_019cb454-9ce5-767d-afea-c3a482d8b3ac" xlink:href="fg-20260331.xsd#fg_CreditAgreementNovember2022Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019cb454-9ce5-74bd-8259-59bae5eb4201" xlink:to="loc_fg_CreditAgreementNovember2022Member_019cb454-9ce5-767d-afea-c3a482d8b3ac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_A740SeniorNotesDue2028Member_019cb454-9ce5-7b75-aec9-28e87606aa56" xlink:href="fg-20260331.xsd#fg_A740SeniorNotesDue2028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019cb454-9ce5-74bd-8259-59bae5eb4201" xlink:to="loc_fg_A740SeniorNotesDue2028Member_019cb454-9ce5-7b75-aec9-28e87606aa56" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_A6.50SeniorNotesDue2029Member_019cb454-9ce5-78a1-9caa-7e69332d4e34" xlink:href="fg-20260331.xsd#fg_A6.50SeniorNotesDue2029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019cb454-9ce5-74bd-8259-59bae5eb4201" xlink:to="loc_fg_A6.50SeniorNotesDue2029Member_019cb454-9ce5-78a1-9caa-7e69332d4e34" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_A6.250SeniorNotesDue2034Member_019d490e-ab67-7d75-8110-853acacdd5ae" xlink:href="fg-20260331.xsd#fg_A6.250SeniorNotesDue2034Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019cb454-9ce5-74bd-8259-59bae5eb4201" xlink:to="loc_fg_A6.250SeniorNotesDue2034Member_019d490e-ab67-7d75-8110-853acacdd5ae" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_A7.950SeniorNotesDue2053Member_019cb454-9ce5-7faa-80e4-7a60ae04e89a" xlink:href="fg-20260331.xsd#fg_A7.950SeniorNotesDue2053Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019cb454-9ce5-74bd-8259-59bae5eb4201" xlink:to="loc_fg_A7.950SeniorNotesDue2053Member_019cb454-9ce5-7faa-80e4-7a60ae04e89a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_A7.300JuniorSubordinatedNotesDue2065Member_019cb454-9ce5-7b66-b698-dd7c3ab8eb5d" xlink:href="fg-20260331.xsd#fg_A7.300JuniorSubordinatedNotesDue2065Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_019cb454-9ce5-74bd-8259-59bae5eb4201" xlink:to="loc_fg_A7.300JuniorSubordinatedNotesDue2065Member_019cb454-9ce5-7b66-b698-dd7c3ab8eb5d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_019cb454-9ce5-702f-b719-2ade212345a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cb454-9ce5-76d1-970b-b00ecf5965d7" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_019cb454-9ce5-702f-b719-2ade212345a5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019cb454-9ce5-702f-b719-2ade212345a5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019cb454-9ce5-702f-b719-2ade212345a5" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019cb454-9ce5-702f-b719-2ade212345a5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_019cb454-9ce5-7a15-90d2-f94a9625f9d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_019cb454-9ce5-702f-b719-2ade212345a5" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_019cb454-9ce5-7a15-90d2-f94a9625f9d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_019cb454-9ce5-7f8f-a354-2b1fa9aa74e7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019cb454-9ce5-7a15-90d2-f94a9625f9d7" xlink:to="loc_us-gaap_LineOfCreditMember_019cb454-9ce5-7f8f-a354-2b1fa9aa74e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_019cb454-9ce5-75fa-b8b5-5b9c7d7c3ca6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_019cb454-9ce5-7a15-90d2-f94a9625f9d7" xlink:to="loc_us-gaap_SeniorNotesMember_019cb454-9ce5-75fa-b8b5-5b9c7d7c3ca6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_019cb454-9ce5-714c-8cfa-59b1437c4ad8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_019cb454-9ce5-76d1-970b-b00ecf5965d7" xlink:to="loc_us-gaap_CreditFacilityAxis_019cb454-9ce5-714c-8cfa-59b1437c4ad8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019cb454-9ce5-714c-8cfa-59b1437c4ad8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_019cb454-9ce5-714c-8cfa-59b1437c4ad8" xlink:to="loc_us-gaap_CreditFacilityDomain_019cb454-9ce5-714c-8cfa-59b1437c4ad8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_019cb454-9ce5-77b5-9ef8-e1af215024e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_019cb454-9ce5-714c-8cfa-59b1437c4ad8" xlink:to="loc_us-gaap_CreditFacilityDomain_019cb454-9ce5-77b5-9ef8-e1af215024e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_019cb454-9ce5-7183-9125-2bf3d73387ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_019cb454-9ce5-77b5-9ef8-e1af215024e8" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_019cb454-9ce5-7183-9125-2bf3d73387ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019cb454-9ce5-79e8-9eee-9a6929426d8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9ce5-7f16-9c9a-5e91b7e4873d" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_019cb454-9ce5-79e8-9eee-9a6929426d8d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDebt_019cb454-9ce5-71dc-a37b-e9b065ec144d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_019cb454-9ce5-7f16-9c9a-5e91b7e4873d" xlink:to="loc_us-gaap_InterestExpenseDebt_019cb454-9ce5-71dc-a37b-e9b065ec144d" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#CommitmentsandContingenciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_019cb454-9ce5-77fc-9786-066d28fcc836" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_019cb454-9ce5-771a-b035-b2c73d9b619a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_019cb454-9ce5-77fc-9786-066d28fcc836" xlink:to="loc_us-gaap_LossContingenciesTable_019cb454-9ce5-771a-b035-b2c73d9b619a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_019d4918-699d-787a-85ba-30bd5e748c16" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019cb454-9ce5-771a-b035-b2c73d9b619a" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_019d4918-699d-787a-85ba-30bd5e748c16" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d4918-699d-787a-85ba-30bd5e748c16_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019d4918-699d-787a-85ba-30bd5e748c16" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d4918-699d-787a-85ba-30bd5e748c16_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d4918-699d-7d9b-afef-fddb91404ecd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_019d4918-699d-787a-85ba-30bd5e748c16" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d4918-699d-7d9b-afef-fddb91404ecd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_RoarJointVentureLLCMember_019d4918-699d-7594-843f-432a25917b80" xlink:href="fg-20260331.xsd#fg_RoarJointVentureLLCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_019d4918-699d-7d9b-afef-fddb91404ecd" xlink:to="loc_fg_RoarJointVentureLLCMember_019d4918-699d-7594-843f-432a25917b80" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_019d4918-a509-75fe-86cd-79c531d9809a" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019cb454-9ce5-771a-b035-b2c73d9b619a" xlink:to="loc_srt_LitigationCaseAxis_019d4918-a509-75fe-86cd-79c531d9809a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_019d4918-a509-75fe-86cd-79c531d9809a_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_LitigationCaseAxis_019d4918-a509-75fe-86cd-79c531d9809a" xlink:to="loc_srt_LitigationCaseTypeDomain_019d4918-a509-75fe-86cd-79c531d9809a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_019d4918-a509-787c-a7ce-2f30610cd111" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_LitigationCaseTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_LitigationCaseAxis_019d4918-a509-75fe-86cd-79c531d9809a" xlink:to="loc_srt_LitigationCaseTypeDomain_019d4918-a509-787c-a7ce-2f30610cd111" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_InsuranceDistributionConsultingLLCV.FidelityGuarantyLifeInsuranceCompanyMember_019d4918-a509-7d8d-8d57-a40591ec2003" xlink:href="fg-20260331.xsd#fg_InsuranceDistributionConsultingLLCV.FidelityGuarantyLifeInsuranceCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_019d4918-a509-787c-a7ce-2f30610cd111" xlink:to="loc_fg_InsuranceDistributionConsultingLLCV.FidelityGuarantyLifeInsuranceCompanyMember_019d4918-a509-7d8d-8d57-a40591ec2003" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_CooperVProgressSoftwareCorpNo123Cv12067Member_019d4918-d233-7bce-97ae-4a00c7a04c7b" xlink:href="fg-20260331.xsd#fg_CooperVProgressSoftwareCorpNo123Cv12067Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_LitigationCaseTypeDomain_019d4918-a509-787c-a7ce-2f30610cd111" xlink:to="loc_fg_CooperVProgressSoftwareCorpNo123Cv12067Member_019d4918-d233-7bce-97ae-4a00c7a04c7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019d4918-a509-7531-911e-a27a3a0c71fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingenciesByNatureOfContingencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019cb454-9ce5-771a-b035-b2c73d9b619a" xlink:to="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019d4918-a509-7531-911e-a27a3a0c71fb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_019d4918-a509-7531-911e-a27a3a0c71fb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019d4918-a509-7531-911e-a27a3a0c71fb" xlink:to="loc_us-gaap_LossContingencyNatureDomain_019d4918-a509-7531-911e-a27a3a0c71fb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNatureDomain_019d4918-a509-7ca2-a810-8d79042f0bb4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LossContingenciesByNatureOfContingencyAxis_019d4918-a509-7531-911e-a27a3a0c71fb" xlink:to="loc_us-gaap_LossContingencyNatureDomain_019d4918-a509-7ca2-a810-8d79042f0bb4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_BreachOfContractMember_019d4918-a509-785e-8f4d-5f4e0facf19f" xlink:href="fg-20260331.xsd#fg_BreachOfContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_019d4918-a509-7ca2-a810-8d79042f0bb4" xlink:to="loc_fg_BreachOfContractMember_019d4918-a509-785e-8f4d-5f4e0facf19f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FailureToPurchaseInterestInContractsMember_019d4918-a509-7043-9288-4d11b63820c3" xlink:href="fg-20260331.xsd#fg_FailureToPurchaseInterestInContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_019d4918-a509-7ca2-a810-8d79042f0bb4" xlink:to="loc_fg_FailureToPurchaseInterestInContractsMember_019d4918-a509-7043-9288-4d11b63820c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DamagesFromProductDefectsMember_019d4918-d233-7744-af1d-18deb4bfd322" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DamagesFromProductDefectsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingencyNatureDomain_019d4918-a509-7ca2-a810-8d79042f0bb4" xlink:to="loc_us-gaap_DamagesFromProductDefectsMember_019d4918-d233-7744-af1d-18deb4bfd322" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusAxis_019d4918-d233-7777-8a13-2b370772dd0d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LitigationStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019cb454-9ce5-771a-b035-b2c73d9b619a" xlink:to="loc_us-gaap_LitigationStatusAxis_019d4918-d233-7777-8a13-2b370772dd0d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusDomain_019d4918-d233-7777-8a13-2b370772dd0d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LitigationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LitigationStatusAxis_019d4918-d233-7777-8a13-2b370772dd0d" xlink:to="loc_us-gaap_LitigationStatusDomain_019d4918-d233-7777-8a13-2b370772dd0d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusDomain_019d4918-d233-7269-bf13-42012763087b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LitigationStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LitigationStatusAxis_019d4918-d233-7777-8a13-2b370772dd0d" xlink:to="loc_us-gaap_LitigationStatusDomain_019d4918-d233-7269-bf13-42012763087b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PendingLitigationMember_019d4918-d233-70c0-82ae-c32e3920ef71" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PendingLitigationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LitigationStatusDomain_019d4918-d233-7269-bf13-42012763087b" xlink:to="loc_us-gaap_PendingLitigationMember_019d4918-d233-70c0-82ae-c32e3920ef71" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019d4919-1301-7472-bd78-79fcb7f173f6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019cb454-9ce5-771a-b035-b2c73d9b619a" xlink:to="loc_srt_RangeAxis_019d4919-1301-7472-bd78-79fcb7f173f6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019d4919-1301-7472-bd78-79fcb7f173f6_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019d4919-1301-7472-bd78-79fcb7f173f6" xlink:to="loc_srt_RangeMember_019d4919-1301-7472-bd78-79fcb7f173f6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019d4919-1301-73b1-9c2f-68a6489fc5f1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019d4919-1301-7472-bd78-79fcb7f173f6" xlink:to="loc_srt_RangeMember_019d4919-1301-73b1-9c2f-68a6489fc5f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019d4919-1301-7601-8532-ed7005d3fc34" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019d4919-1301-73b1-9c2f-68a6489fc5f1" xlink:to="loc_srt_MaximumMember_019d4919-1301-7601-8532-ed7005d3fc34" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_019d4919-1301-783a-af4a-2a94c9102afd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_019cb454-9ce5-771a-b035-b2c73d9b619a" xlink:to="loc_us-gaap_OtherCommitmentsAxis_019d4919-1301-783a-af4a-2a94c9102afd" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_019d4919-1301-783a-af4a-2a94c9102afd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_019d4919-1301-783a-af4a-2a94c9102afd" xlink:to="loc_us-gaap_OtherCommitmentsDomain_019d4919-1301-783a-af4a-2a94c9102afd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_019d4919-1301-7334-96f2-dfe94aa99655" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_019d4919-1301-783a-af4a-2a94c9102afd" xlink:to="loc_us-gaap_OtherCommitmentsDomain_019d4919-1301-7334-96f2-dfe94aa99655" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_LoanCommitmentMember_019d4919-1301-7161-8b9c-fce2d8ac4570" xlink:href="fg-20260331.xsd#fg_LoanCommitmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019d4919-1301-7334-96f2-dfe94aa99655" xlink:to="loc_fg_LoanCommitmentMember_019d4919-1301-7161-8b9c-fce2d8ac4570" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_019d4918-699d-7d5b-96ed-7024e8cb645a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019cb454-9ce5-77fc-9786-066d28fcc836" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh_019d4918-699d-7d5b-96ed-7024e8cb645a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_BusinessCombinationContingentConsiderationLiabilityPaymentPeriod_019d4918-699d-790c-bb6a-7ad0541b7a85" xlink:href="fg-20260331.xsd#fg_BusinessCombinationContingentConsiderationLiabilityPaymentPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019cb454-9ce5-77fc-9786-066d28fcc836" xlink:to="loc_fg_BusinessCombinationContingentConsiderationLiabilityPaymentPeriod_019d4918-699d-790c-bb6a-7ad0541b7a85" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities_019d4918-699d-7370-829f-4b9f9922fec2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019cb454-9ce5-77fc-9786-066d28fcc836" xlink:to="loc_us-gaap_PaymentForContingentConsiderationLiabilityFinancingActivities_019d4918-699d-7370-829f-4b9f9922fec2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019d4918-699d-784d-b10e-e49754086947" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019cb454-9ce5-77fc-9786-066d28fcc836" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_019d4918-699d-784d-b10e-e49754086947" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyDamagesSoughtValue_019d4918-a509-7b2c-ab70-fd480b499e9b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyDamagesSoughtValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019cb454-9ce5-77fc-9786-066d28fcc836" xlink:to="loc_us-gaap_LossContingencyDamagesSoughtValue_019d4918-a509-7b2c-ab70-fd480b499e9b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyPendingClaimsNumber_019d4918-d233-7b20-82ba-0ff636ec0fb2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyPendingClaimsNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019cb454-9ce5-77fc-9786-066d28fcc836" xlink:to="loc_us-gaap_LossContingencyPendingClaimsNumber_019d4918-d233-7b20-82ba-0ff636ec0fb2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNumberOfDefendants_019d4918-d233-7d25-b9af-c43e8ac195a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LossContingencyNumberOfDefendants"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019cb454-9ce5-77fc-9786-066d28fcc836" xlink:to="loc_us-gaap_LossContingencyNumberOfDefendants_019d4918-d233-7d25-b9af-c43e8ac195a7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_LossContingencyPendingClaimsOtherEntitiesNumber_019d4918-d233-7c23-b939-ae0c82a661e4" xlink:href="fg-20260331.xsd#fg_LossContingencyPendingClaimsOtherEntitiesNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019cb454-9ce5-77fc-9786-066d28fcc836" xlink:to="loc_fg_LossContingencyPendingClaimsOtherEntitiesNumber_019d4918-d233-7c23-b939-ae0c82a661e4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitment_019d4919-1301-75b0-9bc1-361895d6656d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019cb454-9ce5-77fc-9786-066d28fcc836" xlink:to="loc_us-gaap_OtherCommitment_019d4919-1301-75b0-9bc1-361895d6656d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseAndOtherAssets_019d4919-1301-7bdf-a573-6419df640295" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PrepaidExpenseAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_019cb454-9ce5-77fc-9786-066d28fcc836" xlink:to="loc_us-gaap_PrepaidExpenseAndOtherAssets_019d4919-1301-7bdf-a573-6419df640295" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/CommitmentsandContingenciesUnfundedCommitmentsDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#CommitmentsandContingenciesUnfundedCommitmentsDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/CommitmentsandContingenciesUnfundedCommitmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsLineItems_019cb454-9ce5-797b-92e1-e77f9750ee82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsTable_019cb454-9ce5-7a8b-9709-6bd00b500cbd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019cb454-9ce5-797b-92e1-e77f9750ee82" xlink:to="loc_us-gaap_OtherCommitmentsTable_019cb454-9ce5-7a8b-9709-6bd00b500cbd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_019d491a-2133-78d4-8226-48d551468888" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OtherCommitmentsTable_019cb454-9ce5-7a8b-9709-6bd00b500cbd" xlink:to="loc_us-gaap_OtherCommitmentsAxis_019d491a-2133-78d4-8226-48d551468888" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_019d491a-2133-78d4-8226-48d551468888_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_019d491a-2133-78d4-8226-48d551468888" xlink:to="loc_us-gaap_OtherCommitmentsDomain_019d491a-2133-78d4-8226-48d551468888_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_019d491a-2133-79c9-a0a3-bde8b74ff2a3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_019d491a-2133-78d4-8226-48d551468888" xlink:to="loc_us-gaap_OtherCommitmentsDomain_019d491a-2133-79c9-a0a3-bde8b74ff2a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FixedMaturitiesAvailableForSaleMember_019d491a-2133-7f5c-9f36-e128fe432456" xlink:href="fg-20260331.xsd#fg_FixedMaturitiesAvailableForSaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019d491a-2133-79c9-a0a3-bde8b74ff2a3" xlink:to="loc_fg_FixedMaturitiesAvailableForSaleMember_019d491a-2133-7f5c-9f36-e128fe432456" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_CommercialMortgageLoansMember_019d491a-2133-7712-a812-bd069edb3a77" xlink:href="fg-20260331.xsd#fg_CommercialMortgageLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019d491a-2133-79c9-a0a3-bde8b74ff2a3" xlink:to="loc_fg_CommercialMortgageLoansMember_019d491a-2133-7712-a812-bd069edb3a77" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ResidentialMortgageLoansMember_019d491a-2133-73da-8e7f-afa468e446fc" xlink:href="fg-20260331.xsd#fg_ResidentialMortgageLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019d491a-2133-79c9-a0a3-bde8b74ff2a3" xlink:to="loc_fg_ResidentialMortgageLoansMember_019d491a-2133-73da-8e7f-afa468e446fc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_OtherAssetCommitmentsMember_019d491a-2133-7a30-8922-a95d4c02f489" xlink:href="fg-20260331.xsd#fg_OtherAssetCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019d491a-2133-79c9-a0a3-bde8b74ff2a3" xlink:to="loc_fg_OtherAssetCommitmentsMember_019d491a-2133-7a30-8922-a95d4c02f489" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermInvestmentsMember_019d491a-2133-76a2-a254-0da2385a5b5e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLongTermInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019d491a-2133-79c9-a0a3-bde8b74ff2a3" xlink:to="loc_us-gaap_OtherLongTermInvestmentsMember_019d491a-2133-76a2-a254-0da2385a5b5e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentsMember_019d491a-2133-71e9-8e91-e47461fd0f9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019d491a-2133-79c9-a0a3-bde8b74ff2a3" xlink:to="loc_us-gaap_EquityMethodInvestmentsMember_019d491a-2133-71e9-8e91-e47461fd0f9f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_WholeLoansMember_019d491a-2133-7991-a48c-7215edaf4ccf" xlink:href="fg-20260331.xsd#fg_WholeLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019d491a-2133-79c9-a0a3-bde8b74ff2a3" xlink:to="loc_fg_WholeLoansMember_019d491a-2133-7991-a48c-7215edaf4ccf" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FixedMaturitySecuritiesAssetBackedSecuritiesMember_019d491a-2133-7674-97e9-15d6ce5f384f" xlink:href="fg-20260331.xsd#fg_FixedMaturitySecuritiesAssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019d491a-2133-79c9-a0a3-bde8b74ff2a3" xlink:to="loc_fg_FixedMaturitySecuritiesAssetBackedSecuritiesMember_019d491a-2133-7674-97e9-15d6ce5f384f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_DirectLendingMember_019d491a-2133-76c0-be81-bdea51e64001" xlink:href="fg-20260331.xsd#fg_DirectLendingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019d491a-2133-79c9-a0a3-bde8b74ff2a3" xlink:to="loc_fg_DirectLendingMember_019d491a-2133-76c0-be81-bdea51e64001" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_CommitmenttoInvestMember_019d491a-2133-7f57-a998-8e42e1f892ca" xlink:href="fg-20260331.xsd#fg_CommitmenttoInvestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_019d491a-2133-79c9-a0a3-bde8b74ff2a3" xlink:to="loc_fg_CommitmenttoInvestMember_019d491a-2133-7f57-a998-8e42e1f892ca" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitment_019d491a-2133-798c-bc21-de95d6338a9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCommitment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsLineItems_019cb454-9ce5-797b-92e1-e77f9750ee82" xlink:to="loc_us-gaap_OtherCommitment_019d491a-2133-798c-bc21-de95d6338a9f" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/InsuranceSubsidiaryFinancialInformationandRegulatoryMattersStatutoryAccountingPracticesDisclosureDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#InsuranceSubsidiaryFinancialInformationandRegulatoryMattersStatutoryAccountingPracticesDisclosureDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/InsuranceSubsidiaryFinancialInformationandRegulatoryMattersStatutoryAccountingPracticesDisclosureDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatutoryAccountingPracticesLineItems_019cb454-9ce5-7c40-beba-b481a108e37f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatutoryAccountingPracticesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatutoryAccountingPracticesTable_019cb454-9ce5-7ff5-9457-bb6d15587f40" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatutoryAccountingPracticesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatutoryAccountingPracticesLineItems_019cb454-9ce5-7c40-beba-b481a108e37f" xlink:to="loc_us-gaap_StatutoryAccountingPracticesTable_019cb454-9ce5-7ff5-9457-bb6d15587f40" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatutoryAccountingPracticesByJurisdictionAxis_019cb454-9ce5-7eda-bdbd-39cdb82ba38a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatutoryAccountingPracticesByJurisdictionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatutoryAccountingPracticesTable_019cb454-9ce5-7ff5-9457-bb6d15587f40" xlink:to="loc_us-gaap_StatutoryAccountingPracticesByJurisdictionAxis_019cb454-9ce5-7eda-bdbd-39cdb82ba38a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_019cb454-9ce5-7eda-bdbd-39cdb82ba38a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatutoryAccountingPracticesJurisdictionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatutoryAccountingPracticesByJurisdictionAxis_019cb454-9ce5-7eda-bdbd-39cdb82ba38a" xlink:to="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_019cb454-9ce5-7eda-bdbd-39cdb82ba38a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_019cb454-9ce5-7b11-a0e7-a4291816da54" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatutoryAccountingPracticesJurisdictionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatutoryAccountingPracticesByJurisdictionAxis_019cb454-9ce5-7eda-bdbd-39cdb82ba38a" xlink:to="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_019cb454-9ce5-7b11-a0e7-a4291816da54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_IA_019cb454-9ce5-76ef-8aff-7af112167273" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_IA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_019cb454-9ce5-7b11-a0e7-a4291816da54" xlink:to="loc_stpr_IA_019cb454-9ce5-76ef-8aff-7af112167273" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_NY_019cb454-9ce5-77d2-9385-9f295a92d5c4" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_NY"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_019cb454-9ce5-7b11-a0e7-a4291816da54" xlink:to="loc_stpr_NY_019cb454-9ce5-77d2-9385-9f295a92d5c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_stpr_VT_019cb454-9ce5-7477-9405-4bd0635ddef9" xlink:href="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd#stpr_VT"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_019cb454-9ce5-7b11-a0e7-a4291816da54" xlink:to="loc_stpr_VT_019cb454-9ce5-7477-9405-4bd0635ddef9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_KY_019cb454-9ce5-7346-a8b2-468919c8de62" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_KY"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesJurisdictionDomain_019cb454-9ce5-7b11-a0e7-a4291816da54" xlink:to="loc_country_KY_019cb454-9ce5-7346-a8b2-468919c8de62" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskAxis_019cb454-9ce5-76c6-85e8-4c819c47a434" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatutoryAccountingPracticesTable_019cb454-9ce5-7ff5-9457-bb6d15587f40" xlink:to="loc_us-gaap_CededCreditRiskAxis_019cb454-9ce5-76c6-85e8-4c819c47a434" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskReinsurerDomain_019cb454-9ce5-76c6-85e8-4c819c47a434_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskReinsurerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CededCreditRiskAxis_019cb454-9ce5-76c6-85e8-4c819c47a434" xlink:to="loc_us-gaap_CededCreditRiskReinsurerDomain_019cb454-9ce5-76c6-85e8-4c819c47a434_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskReinsurerDomain_019cb454-9ce5-72c2-8c95-378cc6f45677" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskReinsurerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CededCreditRiskAxis_019cb454-9ce5-76c6-85e8-4c819c47a434" xlink:to="loc_us-gaap_CededCreditRiskReinsurerDomain_019cb454-9ce5-72c2-8c95-378cc6f45677" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_RavenReinsuranceCompanyMember_019cb454-9ce5-7aa4-b240-159431f43d42" xlink:href="fg-20260331.xsd#fg_RavenReinsuranceCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_019cb454-9ce5-72c2-8c95-378cc6f45677" xlink:to="loc_fg_RavenReinsuranceCompanyMember_019cb454-9ce5-7aa4-b240-159431f43d42" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_CorbeauReMember_019cb454-9ce5-7d69-839e-282c52ddc868" xlink:href="fg-20260331.xsd#fg_CorbeauReMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_019cb454-9ce5-72c2-8c95-378cc6f45677" xlink:to="loc_fg_CorbeauReMember_019cb454-9ce5-7d69-839e-282c52ddc868" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019cb454-9ce5-797a-bb11-b04235e85929" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatutoryAccountingPracticesTable_019cb454-9ce5-7ff5-9457-bb6d15587f40" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019cb454-9ce5-797a-bb11-b04235e85929" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cb454-9ce5-797a-bb11-b04235e85929_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019cb454-9ce5-797a-bb11-b04235e85929" xlink:to="loc_us-gaap_SegmentDomain_019cb454-9ce5-797a-bb11-b04235e85929_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cb454-9ce5-78d7-8613-b6939dfe84ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019cb454-9ce5-797a-bb11-b04235e85929" xlink:to="loc_us-gaap_SegmentDomain_019cb454-9ce5-78d7-8613-b6939dfe84ce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FGSegmentMember_019cb454-9ce5-7b7a-98b4-e75955ea6cdc" xlink:href="fg-20260331.xsd#fg_FGSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019cb454-9ce5-78d7-8613-b6939dfe84ce" xlink:to="loc_fg_FGSegmentMember_019cb454-9ce5-7b7a-98b4-e75955ea6cdc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_StatutoryAccountingPracticesStatutoryNetIncomeLossAmount_019cb454-9ce5-7b54-878a-a56177f39f52" xlink:href="fg-20260331.xsd#fg_StatutoryAccountingPracticesStatutoryNetIncomeLossAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesLineItems_019cb454-9ce5-7c40-beba-b481a108e37f" xlink:to="loc_fg_StatutoryAccountingPracticesStatutoryNetIncomeLossAmount_019cb454-9ce5-7b54-878a-a56177f39f52" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_StatutoryAccountingPracticesStatutoryCapitalAndSurplusDeficitBalance_019cb454-9ce5-7145-ac07-443040a6588c" xlink:href="fg-20260331.xsd#fg_StatutoryAccountingPracticesStatutoryCapitalAndSurplusDeficitBalance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesLineItems_019cb454-9ce5-7c40-beba-b481a108e37f" xlink:to="loc_fg_StatutoryAccountingPracticesStatutoryCapitalAndSurplusDeficitBalance_019cb454-9ce5-7145-ac07-443040a6588c" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/InsuranceSubsidiaryFinancialInformationandRegulatoryMattersNarrativeDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#InsuranceSubsidiaryFinancialInformationandRegulatoryMattersNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/InsuranceSubsidiaryFinancialInformationandRegulatoryMattersNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatutoryAccountingPracticesLineItems_019cb454-9ce5-724c-b15f-2aee8d6dfa00" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatutoryAccountingPracticesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatutoryAccountingPracticesTable_019cb454-9ce5-71cd-854a-08e2c72b36ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatutoryAccountingPracticesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatutoryAccountingPracticesLineItems_019cb454-9ce5-724c-b15f-2aee8d6dfa00" xlink:to="loc_us-gaap_StatutoryAccountingPracticesTable_019cb454-9ce5-71cd-854a-08e2c72b36ae" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskAxis_019cb454-9ce5-7ad7-87a9-689e16a3198f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatutoryAccountingPracticesTable_019cb454-9ce5-71cd-854a-08e2c72b36ae" xlink:to="loc_us-gaap_CededCreditRiskAxis_019cb454-9ce5-7ad7-87a9-689e16a3198f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskReinsurerDomain_019cb454-9ce5-7ad7-87a9-689e16a3198f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskReinsurerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CededCreditRiskAxis_019cb454-9ce5-7ad7-87a9-689e16a3198f" xlink:to="loc_us-gaap_CededCreditRiskReinsurerDomain_019cb454-9ce5-7ad7-87a9-689e16a3198f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CededCreditRiskReinsurerDomain_019cb454-9ce5-7a49-a58c-1ad586c8c8e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CededCreditRiskReinsurerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CededCreditRiskAxis_019cb454-9ce5-7ad7-87a9-689e16a3198f" xlink:to="loc_us-gaap_CededCreditRiskReinsurerDomain_019cb454-9ce5-7a49-a58c-1ad586c8c8e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_FGCaymanReLtdMember_019cb454-9ce5-7d89-829e-13b5eeb31664" xlink:href="fg-20260331.xsd#fg_FGCaymanReLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CededCreditRiskReinsurerDomain_019cb454-9ce5-7a49-a58c-1ad586c8c8e5" xlink:to="loc_fg_FGCaymanReLtdMember_019cb454-9ce5-7d89-829e-13b5eeb31664" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_StatutoryAccountingPracticesPermittedPracticeChangeinStatutoryCapitalandSurplus_019cb454-9ce5-7073-8cd3-32558df6c5e3" xlink:href="fg-20260331.xsd#fg_StatutoryAccountingPracticesPermittedPracticeChangeinStatutoryCapitalandSurplus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesLineItems_019cb454-9ce5-724c-b15f-2aee8d6dfa00" xlink:to="loc_fg_StatutoryAccountingPracticesPermittedPracticeChangeinStatutoryCapitalandSurplus_019cb454-9ce5-7073-8cd3-32558df6c5e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_StatutoryAccountingPracticesNumberOfPermittedPractices_019cb454-9ce5-720e-9da1-5b3d137099c7" xlink:href="fg-20260331.xsd#fg_StatutoryAccountingPracticesNumberOfPermittedPractices"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesLineItems_019cb454-9ce5-724c-b15f-2aee8d6dfa00" xlink:to="loc_fg_StatutoryAccountingPracticesNumberOfPermittedPractices_019cb454-9ce5-720e-9da1-5b3d137099c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_StatutoryAccountingPracticesPermittedPracticeStatutorySurplusAmount_019cb454-9ce5-70cd-b04e-930fff5fed50" xlink:href="fg-20260331.xsd#fg_StatutoryAccountingPracticesPermittedPracticeStatutorySurplusAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatutoryAccountingPracticesLineItems_019cb454-9ce5-724c-b15f-2aee8d6dfa00" xlink:to="loc_fg_StatutoryAccountingPracticesPermittedPracticeStatutorySurplusAmount_019cb454-9ce5-70cd-b04e-930fff5fed50" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/EarningsPerShareComputationofBasicandDilutedEarningsPerShareDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#EarningsPerShareComputationofBasicandDilutedEarningsPerShareDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/EarningsPerShareComputationofBasicandDilutedEarningsPerShareDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicLineItems_019cb454-9ce5-76b8-95b1-b4b11a33908c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasicLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_019cb454-9ce5-7299-afad-a542c2084541" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019cb454-9ce5-76b8-95b1-b4b11a33908c" xlink:to="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_019cb454-9ce5-7299-afad-a542c2084541" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019cb454-9ce5-728d-bd77-e75fc25112cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_019cb454-9ce5-7299-afad-a542c2084541" xlink:to="loc_us-gaap_AwardTypeAxis_019cb454-9ce5-728d-bd77-e75fc25112cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cb454-9ce5-728d-bd77-e75fc25112cf_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019cb454-9ce5-728d-bd77-e75fc25112cf" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cb454-9ce5-728d-bd77-e75fc25112cf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cb454-9ce5-7bbb-825d-40936d996ab7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019cb454-9ce5-728d-bd77-e75fc25112cf" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cb454-9ce5-7bbb-825d-40936d996ab7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_019cb454-9ce5-7e5b-b417-22e0b3aaddce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cb454-9ce5-7bbb-825d-40936d996ab7" xlink:to="loc_us-gaap_RestrictedStockMember_019cb454-9ce5-7e5b-b417-22e0b3aaddce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019cb454-9ce5-7df2-9ebd-b126954a2941" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019cb454-9ce5-76b8-95b1-b4b11a33908c" xlink:to="loc_us-gaap_ProfitLoss_019cb454-9ce5-7df2-9ebd-b126954a2941" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019cb454-9ce5-7af6-b4fd-b084f197fdd6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019cb454-9ce5-76b8-95b1-b4b11a33908c" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_019cb454-9ce5-7af6-b4fd-b084f197fdd6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_019cb454-9ce5-77e3-8dbb-1c8ae56d1986" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019cb454-9ce5-76b8-95b1-b4b11a33908c" xlink:to="loc_us-gaap_NetIncomeLoss_019cb454-9ce5-77e3-8dbb-1c8ae56d1986" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019cb454-9ce5-7cc8-8482-09177f6aab41" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockDividendsIncomeStatementImpact"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019cb454-9ce5-76b8-95b1-b4b11a33908c" xlink:to="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_019cb454-9ce5-7cc8-8482-09177f6aab41" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019cb454-9ce5-710f-82dd-1941b0f50b9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019cb454-9ce5-76b8-95b1-b4b11a33908c" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_019cb454-9ce5-710f-82dd-1941b0f50b9c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019cb454-9ce5-7e37-8ae7-644e4e3558e0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019cb454-9ce5-76b8-95b1-b4b11a33908c" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_019cb454-9ce5-7e37-8ae7-644e4e3558e0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_019cb454-9ce5-7dd3-bf50-f4745cb25cde" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019cb454-9ce5-76b8-95b1-b4b11a33908c" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_019cb454-9ce5-7dd3-bf50-f4745cb25cde" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock_019cb454-9ce5-7ac2-a161-96786570c60f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019cb454-9ce5-76b8-95b1-b4b11a33908c" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToConversionOfPreferredStock_019cb454-9ce5-7ac2-a161-96786570c60f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019cb454-9ce5-7670-a77a-f8759af4d036" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019cb454-9ce5-76b8-95b1-b4b11a33908c" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_019cb454-9ce5-7670-a77a-f8759af4d036" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_019cb454-9ce5-7f6a-a3dc-bc567ede913f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019cb454-9ce5-76b8-95b1-b4b11a33908c" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_019cb454-9ce5-7f6a-a3dc-bc567ede913f" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_019cb454-9ce5-77c0-8793-58c93bea4b99" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_019cb454-9ce5-7f6a-a3dc-bc567ede913f" xlink:to="loc_us-gaap_EarningsPerShareBasic_019cb454-9ce5-77c0-8793-58c93bea4b99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_019cb454-9ce5-7dab-aa16-58c7975b682d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasicAbstract_019cb454-9ce5-7f6a-a3dc-bc567ede913f" xlink:to="loc_us-gaap_EarningsPerShareDiluted_019cb454-9ce5-7dab-aa16-58c7975b682d" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/EarningsPerShareNarrativeDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#EarningsPerShareNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/EarningsPerShareNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicLineItems_019cb454-9ce5-7f64-869d-119534769f66" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasicLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_019cb454-9ce5-76a8-8c90-df16d1105b69" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019cb454-9ce5-7f64-869d-119534769f66" xlink:to="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_019cb454-9ce5-76a8-8c90-df16d1105b69" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_019cb454-9ce5-7e80-83e9-96dce53fa7e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_019cb454-9ce5-76a8-8c90-df16d1105b69" xlink:to="loc_us-gaap_AwardTypeAxis_019cb454-9ce5-7e80-83e9-96dce53fa7e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cb454-9ce5-7e80-83e9-96dce53fa7e2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_019cb454-9ce5-7e80-83e9-96dce53fa7e2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cb454-9ce5-7e80-83e9-96dce53fa7e2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cb454-9ce5-7a2c-9867-eb06b75f174c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_019cb454-9ce5-7e80-83e9-96dce53fa7e2" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cb454-9ce5-7a2c-9867-eb06b75f174c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_019cb454-9ce5-7630-97c2-003b346bb846" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_019cb454-9ce5-7a2c-9867-eb06b75f174c" xlink:to="loc_us-gaap_RestrictedStockMember_019cb454-9ce5-7630-97c2-003b346bb846" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019cb454-9ce5-7427-938e-32255e5048c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_019cb454-9ce5-76a8-8c90-df16d1105b69" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019cb454-9ce5-7427-938e-32255e5048c3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019cb454-9ce5-7427-938e-32255e5048c3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019cb454-9ce5-7427-938e-32255e5048c3" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019cb454-9ce5-7427-938e-32255e5048c3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019cb454-9ce5-75a9-8237-f1b3b07e6b9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis_019cb454-9ce5-7427-938e-32255e5048c3" xlink:to="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019cb454-9ce5-75a9-8237-f1b3b07e6b9c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockMember_019cb454-9ce5-76ef-aea8-35e175504312" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019cb454-9ce5-75a9-8237-f1b3b07e6b9c" xlink:to="loc_us-gaap_RestrictedStockMember_019cb454-9ce5-76ef-aea8-35e175504312" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertiblePreferredStockMember_019cb454-9ce5-7be4-85f6-9ef266d7e985" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesNameDomain_019cb454-9ce5-75a9-8237-f1b3b07e6b9c" xlink:to="loc_us-gaap_ConvertiblePreferredStockMember_019cb454-9ce5-7be4-85f6-9ef266d7e985" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_019cb454-9ce5-7225-8b54-d6140c4521e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_019cb454-9ce5-76a8-8c90-df16d1105b69" xlink:to="loc_us-gaap_StatementClassOfStockAxis_019cb454-9ce5-7225-8b54-d6140c4521e3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb454-9ce5-7225-8b54-d6140c4521e3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019cb454-9ce5-7225-8b54-d6140c4521e3" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb454-9ce5-7225-8b54-d6140c4521e3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_019cb454-9ce5-7533-a051-6b7cff0ef1fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_019cb454-9ce5-7225-8b54-d6140c4521e3" xlink:to="loc_us-gaap_ClassOfStockDomain_019cb454-9ce5-7533-a051-6b7cff0ef1fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_019cb454-9ce5-7a17-b9d3-5884acb97f1a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_019cb454-9ce5-7533-a051-6b7cff0ef1fd" xlink:to="loc_us-gaap_CommonStockMember_019cb454-9ce5-7a17-b9d3-5884acb97f1a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_019cb454-9ce5-7154-9528-4b7d7f1d07e7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_019cb454-9ce5-76a8-8c90-df16d1105b69" xlink:to="loc_srt_RangeAxis_019cb454-9ce5-7154-9528-4b7d7f1d07e7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cb454-9ce5-7154-9528-4b7d7f1d07e7_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_019cb454-9ce5-7154-9528-4b7d7f1d07e7" xlink:to="loc_srt_RangeMember_019cb454-9ce5-7154-9528-4b7d7f1d07e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_019cb454-9ce5-7944-9099-42061e0c98e9" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_019cb454-9ce5-7154-9528-4b7d7f1d07e7" xlink:to="loc_srt_RangeMember_019cb454-9ce5-7944-9099-42061e0c98e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_019cb454-9ce5-7a47-9331-fd0845992c3f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019cb454-9ce5-7944-9099-42061e0c98e9" xlink:to="loc_srt_MinimumMember_019cb454-9ce5-7a47-9331-fd0845992c3f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_019cb454-9ce5-7333-9c0b-10ac21b27adf" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_019cb454-9ce5-7944-9099-42061e0c98e9" xlink:to="loc_srt_MaximumMember_019cb454-9ce5-7333-9c0b-10ac21b27adf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_019cb454-9ce5-737e-aed9-6071ba2a316d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEarningsPerShareBasicByCommonClassTable_019cb454-9ce5-76a8-8c90-df16d1105b69" xlink:to="loc_srt_StatementScenarioAxis_019cb454-9ce5-737e-aed9-6071ba2a316d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019cb454-9ce5-737e-aed9-6071ba2a316d_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_019cb454-9ce5-737e-aed9-6071ba2a316d" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019cb454-9ce5-737e-aed9-6071ba2a316d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019cb454-9ce5-76c2-896e-8aa7707b58e0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_019cb454-9ce5-737e-aed9-6071ba2a316d" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019cb454-9ce5-76c2-896e-8aa7707b58e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_019cb454-9ce5-7655-b986-457a3e51e85f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_019cb454-9ce5-76c2-896e-8aa7707b58e0" xlink:to="loc_srt_ScenarioForecastMember_019cb454-9ce5-7655-b986-457a3e51e85f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019cb454-9ce5-7e42-bac0-fea7f738e365" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019cb454-9ce5-7f64-869d-119534769f66" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_019cb454-9ce5-7e42-bac0-fea7f738e365" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockConvertibleConversionRatio_019cb454-9ce5-75f7-b876-af2c4ba90dd0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockConvertibleConversionRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicLineItems_019cb454-9ce5-7f64-869d-119534769f66" xlink:to="loc_us-gaap_PreferredStockConvertibleConversionRatio_019cb454-9ce5-75f7-b876-af2c4ba90dd0" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.fg.com/role/SegmentInformationSummarizedInformationforSingleReportableSegmentDetails" xlink:type="simple" xlink:href="fg-20260331.xsd#SegmentInformationSummarizedInformationforSingleReportableSegmentDetails"/>
  <link:definitionLink xlink:role="http://www.fg.com/role/SegmentInformationSummarizedInformationforSingleReportableSegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_019cb454-9ce5-72e7-8917-ee127b2229f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cb454-9ce5-704c-8cf5-49605b5aa2ed" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cb454-9ce5-72e7-8917-ee127b2229f7" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cb454-9ce5-704c-8cf5-49605b5aa2ed" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_019cb454-9ce5-70cb-8aca-c63abd0171ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_019cb454-9ce5-704c-8cf5-49605b5aa2ed" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_019cb454-9ce5-70cb-8aca-c63abd0171ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cb454-9ce5-70cb-8aca-c63abd0171ca_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019cb454-9ce5-70cb-8aca-c63abd0171ca" xlink:to="loc_us-gaap_SegmentDomain_019cb454-9ce5-70cb-8aca-c63abd0171ca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_019cb454-9ce5-7ecd-86be-c8cb3b389681" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_019cb454-9ce5-70cb-8aca-c63abd0171ca" xlink:to="loc_us-gaap_SegmentDomain_019cb454-9ce5-7ecd-86be-c8cb3b389681" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_ReportableSegmentMember_019cb454-9ce5-7b57-82b1-ed3386ed754e" xlink:href="fg-20260331.xsd#fg_ReportableSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_019cb454-9ce5-7ecd-86be-c8cb3b389681" xlink:to="loc_fg_ReportableSegmentMember_019cb454-9ce5-7b57-82b1-ed3386ed754e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_019cb454-9ce5-7d5b-9dc2-01c9c1c8be74" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenuesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cb454-9ce5-72e7-8917-ee127b2229f7" xlink:to="loc_us-gaap_RevenuesAbstract_019cb454-9ce5-7d5b-9dc2-01c9c1c8be74" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_LifeContingentPensionRiskTransferPremiums_019cb454-9ce5-795e-a2e1-092c773b9911" xlink:href="fg-20260331.xsd#fg_LifeContingentPensionRiskTransferPremiums"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019cb454-9ce5-7d5b-9dc2-01c9c1c8be74" xlink:to="loc_fg_LifeContingentPensionRiskTransferPremiums_019cb454-9ce5-795e-a2e1-092c773b9911" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_TraditionalLifeInsuranceAndLifeContingentImmediateAnnuityPremiums_019cb454-9ce5-7675-8738-a828305bed05" xlink:href="fg-20260331.xsd#fg_TraditionalLifeInsuranceAndLifeContingentImmediateAnnuityPremiums"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019cb454-9ce5-7d5b-9dc2-01c9c1c8be74" xlink:to="loc_fg_TraditionalLifeInsuranceAndLifeContingentImmediateAnnuityPremiums_019cb454-9ce5-7675-8738-a828305bed05" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_SurrenderCharges_019cb454-9ce5-7682-b726-468dd12f05ef" xlink:href="fg-20260331.xsd#fg_SurrenderCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019cb454-9ce5-7d5b-9dc2-01c9c1c8be74" xlink:to="loc_fg_SurrenderCharges_019cb454-9ce5-7682-b726-468dd12f05ef" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PolicyholderFeesAndOtherIncome_019cb454-9ce5-779c-bced-f96f4455d310" xlink:href="fg-20260331.xsd#fg_PolicyholderFeesAndOtherIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019cb454-9ce5-7d5b-9dc2-01c9c1c8be74" xlink:to="loc_fg_PolicyholderFeesAndOtherIncome_019cb454-9ce5-779c-bced-f96f4455d310" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DirectPremiumsWritten_019cb454-9ce5-7cb1-b758-a152143ae1ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DirectPremiumsWritten"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019cb454-9ce5-7d5b-9dc2-01c9c1c8be74" xlink:to="loc_us-gaap_DirectPremiumsWritten_019cb454-9ce5-7cb1-b758-a152143ae1ee" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InsuranceCommissionsAndFees_019cb454-9ce5-70ea-a43a-de16c754ef5e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InsuranceCommissionsAndFees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019cb454-9ce5-7d5b-9dc2-01c9c1c8be74" xlink:to="loc_us-gaap_InsuranceCommissionsAndFees_019cb454-9ce5-70ea-a43a-de16c754ef5e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InsuranceServicesRevenue_019cb454-9ce5-798b-afef-402604bc07e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InsuranceServicesRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019cb454-9ce5-7d5b-9dc2-01c9c1c8be74" xlink:to="loc_us-gaap_InsuranceServicesRevenue_019cb454-9ce5-798b-afef-402604bc07e9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentIncome_019cb454-9ce5-7fb3-87b0-20848d4c6ec3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetInvestmentIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019cb454-9ce5-7d5b-9dc2-01c9c1c8be74" xlink:to="loc_us-gaap_NetInvestmentIncome_019cb454-9ce5-7fb3-87b0-20848d4c6ec3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnInvestments_019cb454-9ce5-7edc-b785-4ecf54369b62" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019cb454-9ce5-7d5b-9dc2-01c9c1c8be74" xlink:to="loc_us-gaap_GainLossOnInvestments_019cb454-9ce5-7edc-b785-4ecf54369b62" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_019cb454-9ce5-747c-a2fa-12fc7416be07" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Revenues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesAbstract_019cb454-9ce5-7d5b-9dc2-01c9c1c8be74" xlink:to="loc_us-gaap_Revenues_019cb454-9ce5-747c-a2fa-12fc7416be07" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpensesAbstract_019cb454-9ce5-71a8-b69b-7c39ec045747" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CostsAndExpensesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cb454-9ce5-72e7-8917-ee127b2229f7" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_019cb454-9ce5-71a8-b69b-7c39ec045747" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PolicyholderBenefitsAndClaimsIncurredNetLifeAndAnnuityRemeasurementGainsLosses_019cb454-9ce5-7904-a71f-0af3dab0139f" xlink:href="fg-20260331.xsd#fg_PolicyholderBenefitsAndClaimsIncurredNetLifeAndAnnuityRemeasurementGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_019cb454-9ce5-71a8-b69b-7c39ec045747" xlink:to="loc_fg_PolicyholderBenefitsAndClaimsIncurredNetLifeAndAnnuityRemeasurementGainsLosses_019cb454-9ce5-7904-a71f-0af3dab0139f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_019cb454-9ce5-78aa-b5c0-70b9c6126e45" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_019cb454-9ce5-71a8-b69b-7c39ec045747" xlink:to="loc_us-gaap_LaborAndRelatedExpense_019cb454-9ce5-78aa-b5c0-70b9c6126e45" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCostAndExpenseOperating_019cb454-9ce5-7836-b7be-505492297626" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherCostAndExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_019cb454-9ce5-71a8-b69b-7c39ec045747" xlink:to="loc_us-gaap_OtherCostAndExpenseOperating_019cb454-9ce5-7836-b7be-505492297626" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_SegmentReportingSignificantExpenseTotal_019cb454-9ce5-750d-a237-2d1337624d65" xlink:href="fg-20260331.xsd#fg_SegmentReportingSignificantExpenseTotal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_019cb454-9ce5-71a8-b69b-7c39ec045747" xlink:to="loc_fg_SegmentReportingSignificantExpenseTotal_019cb454-9ce5-750d-a237-2d1337624d65" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_OtherSegmentAbstract_019cb454-9ce5-77fa-8dd2-f89cdea99e3e" xlink:href="fg-20260331.xsd#fg_OtherSegmentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cb454-9ce5-72e7-8917-ee127b2229f7" xlink:to="loc_fg_OtherSegmentAbstract_019cb454-9ce5-77fa-8dd2-f89cdea99e3e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MarketRiskBenefitChangeInFairValueGainLoss_019cb454-9ce5-7abc-98ce-cb4d30e2f515" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MarketRiskBenefitChangeInFairValueGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_OtherSegmentAbstract_019cb454-9ce5-77fa-8dd2-f89cdea99e3e" xlink:to="loc_us-gaap_MarketRiskBenefitChangeInFairValueGainLoss_019cb454-9ce5-7abc-98ce-cb4d30e2f515" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepreciationAndAmortization_019cb454-9ce5-71a5-b312-6c80d525ac70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_OtherSegmentAbstract_019cb454-9ce5-77fa-8dd2-f89cdea99e3e" xlink:to="loc_us-gaap_DepreciationAndAmortization_019cb454-9ce5-71a5-b312-6c80d525ac70" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOperating_019cb454-9ce5-7bdd-9402-b2c2086d7313" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_OtherSegmentAbstract_019cb454-9ce5-77fa-8dd2-f89cdea99e3e" xlink:to="loc_us-gaap_InterestExpenseOperating_019cb454-9ce5-7bdd-9402-b2c2086d7313" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_SegmentReportingOtherItemsTotal_019cb454-9ce5-7801-af9a-14afcc256ec5" xlink:href="fg-20260331.xsd#fg_SegmentReportingOtherItemsTotal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_fg_OtherSegmentAbstract_019cb454-9ce5-77fa-8dd2-f89cdea99e3e" xlink:to="loc_fg_SegmentReportingOtherItemsTotal_019cb454-9ce5-7801-af9a-14afcc256ec5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_BenefitsLossesAndExpensesNet_019cb454-9ce5-7b73-b509-78789cf2de9f" xlink:href="fg-20260331.xsd#fg_BenefitsLossesAndExpensesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cb454-9ce5-72e7-8917-ee127b2229f7" xlink:to="loc_fg_BenefitsLossesAndExpensesNet_019cb454-9ce5-7b73-b509-78789cf2de9f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperations_019cb454-9ce5-7f4c-a8de-0e0a3573c017" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cb454-9ce5-72e7-8917-ee127b2229f7" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperations_019cb454-9ce5-7f4c-a8de-0e0a3573c017" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_019cb454-9ce5-7485-8087-11b78771f314" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cb454-9ce5-72e7-8917-ee127b2229f7" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_019cb454-9ce5-7485-8087-11b78771f314" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_019cb454-9ce5-7b66-b47e-92e4c262e582" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_019cb454-9ce5-72e7-8917-ee127b2229f7" xlink:to="loc_us-gaap_ProfitLoss_019cb454-9ce5-7b66-b47e-92e4c262e582" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_fg_PolicyholderBenefitsAndClaimsIncurredNetLifeAndAnnuityRemeasurementGainsLosses_019cb454-9413-7703-bab6-74e2740b56ed" xlink:href="fg-20260331.xsd#fg_PolicyholderBenefitsAndClaimsIncurredNetLifeAndAnnuityRemeasurementGainsLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementAbstract" xlink:to="loc_fg_PolicyholderBenefitsAndClaimsIncurredNetLifeAndAnnuityRemeasurementGainsLosses_019cb454-9413-7703-bab6-74e2740b56ed" xlink:type="arc" order="691"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest" xlink:type="arc" order="101"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PolicyholderFunds" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PolicyholderFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract" xlink:to="loc_us-gaap_PolicyholderFunds" xlink:type="arc" order="31"/>
  </link:definitionLink>
</link:linkbase>
