Kinship through breastfeeding is established through the father or the mother

Question:
My mother breastfed a child several times, and she was not in my father’s marriage; rather, she was married to another man when she breastfed this child. Does he become my brother through breastfeeding?

Answer:
Yes, if your mother breastfed him—the girl or the boy—completely within the two-year period, with five breastfeedings or more within the two years; he becomes your brother through your mother via breastfeeding. If your mother breastfed a boy or a girl, and the child was within the two-year period, and the breastfeeding was five times or more, then the boy becomes your brother, and the girl becomes your sister through your mother, and a sister to all the children of this woman, and a sister to all the children of her husband whom she breastfed while she was in his marriage.