Is it permissible to marry the daughter of my brother who was breastfed by my sister?
It is permissible to marry the girl in question unless there is proof of a Sharia-compliant suckling relationship between you two. The suckling of your brother by her relative does not prohibit her to you. The suckling that causes prohibition requires five known sucklings, according to the preponderant opinion.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
Read the full answer on Ftawyhttps://ftawy.com/en/questions/143682