Ruling on a man marrying the daughter of a woman who breastfed his sister

Question:
Following this, a message was received by the program from one of the listening brothers, who indicated his name with the letters (A. Z. Y). He says: I am a young man who is eighteen years old. I proposed to my cousin, but they refused on the grounds that we are siblings through breastfeeding. However, I did not breastfeed from her mother, and she did not breastfeed from my mother. But her mother breastfed my sister, who is my sister only through our father. Is it true that we are siblings through breastfeeding, or not?

The Shaykh: Repeat.

The presenter : He says: I am a young man who is eighteen years old. I proposed to my cousin, but they refused on the grounds that we are siblings through breastfeeding. However, I did not breastfeed from her mother, and she did not breastfeed from my mother. But her mother breastfed my sister, who is my sister only through our father. Is it true that we are siblings through breastfeeding, or not? And is my marriage to her valid, or not? May Allah reward you with good.

Answer:
If the situation is as you described in the question, there is no harm in marrying her. Her mother’s breastfeeding of her sister does not extend to her. Rather, there is no harm in marrying her, because she is not your sister through breastfeeding, if the situation is as you described in the question. Yes.

The presenter: May Allah reward you with good.