are his grandparents, and her brothers and sisters are his maternal uncles and aunts. Marriage to any of these relatives is forbidden to him. However, “the daughters of his maternal uncles and aunts through breastfeeding” are lawful for him to marry, just as their counterparts through blood relationship are lawful.

The man’s relatives are likewise his relatives through breastfeeding: his siblings’ children, and their children, are his siblings’ children. The man’s brothers and sisters are his paternal uncles and aunts, whom he may not marry. He may, however, marry the daughters of his paternal uncles and aunts.

The breastfed child’s children have the same standing as he does, just as a biological child’s children have the same standing as their parent. Thus, his children, whether through blood relationship or breastfeeding, may not marry his siblings or his father’s siblings, whether related by blood or breastfeeding, because these are their paternal and maternal uncles and aunts.

As for the breastfed child’s siblings through blood relationship, or through breastfeeding by a woman other than this wet nurse, they are unrelated to her and her relatives. The siblings in question may therefore marry the wet nurse’s children. This is comparable to a man having a brother through his father and a sister through his mother, or vice versa: those two may marry one another, whereas he himself may marry neither.

Likewise, the breastfed child himself may not marry any of his wet nurse’s children or any of his own parents’ children: the former are his siblings through breastfeeding, and the latter are his siblings through blood relationship. His siblings through breastfeeding may marry his siblings through blood relationship, just as his siblings through his father may marry his siblings through his mother. The scholars agree on all of this.