The ruling on a man marrying the daughters of a man who was breastfed by the same woman

Question:
If a man was breastfed by my mother after she had lost her husband (other than my father), may I marry the daughters of that breastfed man, or not?

Answer:
No. If a person is breastfed by your mother, and she is with another husband other than your father, or if she has no husband, and you provide for him, and she breastfeeds him five times within the two-year period, even if she has no husband because she was divorced or her husband died, then this breastfed child becomes your brother, and his daughter becomes your sister. You may not marry her. You are her maternal uncle, so you may not marry her, provided that the man who was breastfed by your mother was from a husband other than your father, or if you provided for him when she was older and had no husband, and she breastfed him five times or more while he was within the two-year period; then he becomes your brother, and his daughters become your sisters, and it is not permissible for you to marry any of them.