What does breastfeeding prohibit?

Question:
I have an older brother, who is the eldest of my brothers. He breastfed from my uncle’s wife, approximately more than five times. Are his daughters permissible for my older brother and my other brothers, or not?

Answer:
In any case, if your brother breastfed from your grandfather’s wife, meaning your uncle’s wife, your grandfather’s wife, meaning, this is your uncle, your father’s brother. If a woman breastfed from your grandfather’s wife, she becomes your sister, a sister to her father, and a sister to her uncles.

Question: I mean, are his daughters not permissible for me?

Answer: You are their uncle, but they are not permissible for your children; because he became their uncle through breastfeeding, and an uncle to your daughters and all your sons. If a person breastfeeds from your grandfather’s wife, he becomes your brother, and your brothers’ brother, and becomes an uncle to your children through breastfeeding. What is prohibited by breastfeeding is prohibited by blood relation.