Do the brothers of the foster mother’s children from their father become brothers to the girl their paternal aunt breastfed?
Anyone who has been nursed by a woman five times or more within the first two years of life becomes her child and the child of her husband, the owner of the milk (fahl's milk). Accordingly, the children of the nursing woman become siblings to the nursed child, and the girl becomes a sister to all the children of the owner of the milk. The jurisprudential rule regarding suckling is: "What is prohibited by lineage is also prohibited by suckling."
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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