Is it permissible to marry a girl whose sister was breastfed with my brother?
It is permissible to marry the aforementioned girl. The nursing of the suitor's younger sister with her brother does not prohibit her, unless there was another direct nursing between the suitor and the girl, or a shared nursing from another woman. The prohibitive nursing must consist of five full, satisfying feedings.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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