What is the ruling on marrying a foster sister to a blood brother?
Source: FtawySummary from Ftawy's records · added here Sep 2, 2026
One who has been suckled five full feedings from milk resulting from a man's cohabitation becomes his daughter, and his brothers become her paternal uncles. Therefore, she is not permissible for her paternal uncle through suckling. The evidence for this is the narration of Aishah (may Allah be pleased with her) when Aflah, the brother of Abu Al-Quays, sought permission to enter upon her. The Prophet (peace and blessings of Allah be upon him) informed her that he was her paternal uncle through suckling and that she should grant him permission.
Summary from Ftawy's records · added here
Reviewed by El Fatwa's sharia committee.
Read the full answer on Ftawyhttps://ftawy.com/en/questions/50991
Where this answer came from
- Source platform
- Ftawy
- Original fatwa ID
- 50991
- Added here
- . This is when the answer was added to El Fatwa, not the fatwa's date.
- Text
- Summary from Ftawy's records, reviewed by El Fatwa's sharia committee.
- Read the full ruling
- Read the full answer on Ftawy