Is it permissible for a man to marry his wife's paternal aunt (or his father's paternal aunt) through nursing if he was nursed by his paternal aunt?
Suckling establishes the same prohibitions as lineage, for the Prophet, peace and blessings be upon him, said: "What is prohibited by lineage is prohibited by suckling." So, if a man suckles from a woman, he becomes a son to her and to her husband. Consequently, he is not permitted to marry his father's paternal aunt from suckling, because she is in the same position as a paternal aunt by lineage. The predominant opinion is that prohibitory suckling requires five known sucklings.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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