What is the ruling on a man marrying a female relative if the man's mother breastfed his brother and that female relative? And what is the number of breastfeedings that establish prohibition? What if he himself was not breastfed by his mother? And would he be sinful if this marriage took place?
If your female relative was suckled by your mother, then she is your sister through suckling (rada'a), and consequently, her daughter is considered the daughter of your sister through suckling. Therefore, it is impermissible for you to marry her, for suckling prohibits what lineage prohibits.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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