The Paternal Aunts of Your Sisters Through Breast- feeding Are Forbidden to You

Question :

I have sisters through breast-feeding and they have paternal aunts; are the paternal aunts of my sisters through breast-feeding aunts to me or not? And are they forbidden to me as they would be forbidden to me due to kinship? Benefit me (with advice) and may Allah benefit you.

Answer:

If you are a brother to them from the father's side, or from both parents through breast-feeding, then their paternal aunts are paternal aunts to you, because they are your father's sisters through breast-feeding. So it is not permissible for you to marry them, just like aunts through kinship, according to the words of the Prophet ﷺ:
"That which is forbidden due to kinship is forbidden due to breast- feeding."

This is the case, unless they are paternal aunts to your sisters from their father through breast-feeding and not your father.

Because they were breast-fed by a woman who did not breastfeed you, so they will be unrelated to you, and there will be no objection to your marrying any of them, as they will not be paternal aunts to you, but only aunts to your sisters. This is because they are your sisters by their father due to breast-feeding, not your father. And Allah is the Granter of success.

Source:
Ibn Baz
Fatawa Islamiyah, Vol. 6 Page 142