The Ruling on the Marriage of an Infant to His Suckling Sisters

Question:
This is a message that came from Jalal in Iraq, in the province of Nineveh. The brother Jalal says in his message: I was breastfed by my uncle’s wife along with one of her daughters, so I became her brother through breastfeeding. My question is: Is it permissible for me to marry any of my other sisters under any circumstances? And is it permissible for my brothers to marry the girl I was breastfed with, or her sisters? Please inform us; may Allah reward you.

Answer:
As for you, the one who was breastfed, it is not permissible for you to marry any of them, neither the daughters of the woman nor the daughters of her husband, even if they are from another wife. This is because you have become a son to both of them. If the breastfeeding occurred five times or more, and you were within the age of two, then you are a son to the nursing mother and a son to her husband, the provider of the milk. You are a brother to all of their children: a brother to the woman’s children from this husband and from others, and a brother to the man’s children from this wife and from others. She has become your mother, and it is not permissible for you to marry any of their children. As for your brothers, there is no harm if they marry the daughters of the man, because they are not their brothers. Rather, you are the one who was breastfed by their mother, so you are their father. As for your brothers, there is no harm or blame on them, provided that there was no breastfeeding between them and these girls, and that the girls were not breastfed by your mother, your father’s wife, or your sisters. The one for whom marriage is forbidden is you, because you are their brother. As for your brothers, they are not their brothers. No.