Is it permissible for a woman to breastfeed her infant sister or her infant granddaughter?
A woman is permitted to breastfeed her sister or her granddaughter, and by doing so, they become her daughters and her husband's daughters through suckling. The prohibition [of marriage] is established by five full and satisfying breastfeedings.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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