Breastfed by his sister, so is his wife’s sister his aunt, and does she become a mahram (a relative one may not marry) to him?

Question:
He says: I was breastfed by my sister. Huh? He says: I was breastfed by my sister, so is my wife’s sister my aunt? And is it permissible for me to uncover her? And if I do not do so, is that cutting off family ties?

Answer:
Yes, if you were breastfed by your sister, then you are her son and the son of her husband through breastfeeding, and the wife’s sister becomes your aunt through breastfeeding, in terms of being a mahram (a relative one may not marry). As for maintaining ties, she does not fall under this; she is not a relative. Maintaining ties is for relatives. The wet nurse is not a relative, and she is not among those with kinship ties. She has the rights of a Muslim, she has the general rights of a Muslim. Yes.