Is it permissible for the husband's brother to marry his wife's sister, who was nursed by his wife (the mother of his children)?
Source: FtawySummary from Ftawy's records · added here Sep 2, 2026
If a woman breastfeeds her sister five times, then this sister becomes unlawful for the brother of the woman's husband, because he becomes her paternal uncle through rada'ah (fosterage), if the breastfeeding was with the milk of his brother. This is based on the Prophet’s (peace be upon him) saying: "What is unlawful by lineage is unlawful by rada'ah."
Summary from Ftawy's records · added here
Reviewed by El Fatwa's sharia committee.
Read the full answer on Ftawyhttps://ftawy.com/en/questions/97224
Where this answer came from
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- Ftawy
- Original fatwa ID
- 97224
- 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