Is it permissible for a sister to breastfeed her infant brother when the mother is ill and unable to breastfeed him?
It is permissible for a woman to breastfeed her full or half-siblings, whether their mother is ill or not. However, it is preferable for another woman to breastfeed them to avoid the prohibition of marriage between them due to fosterage.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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