Marrying a cousin whose brother has suckled from his mother

Q: As I would like to avoid doubts, my story is as follows: First: I am a young man who would like to marry the daughter of my paternal aunt.Second: The son of my paternal aunt was breastfed with my full-sister; although my sister has since passed away.My question is: Is it permissible for me to marry my paternal cousin, bearing in mind that my aunt’s son married a woman from outside my family. I hope that you will advise us and may Allah grant you success to do what pleases Him. Peace, Mercy, and Blessings of Allah be upon you!

A: If the reality is as you mentioned, it is permissible for you to marry your paternal cousin, and the fact that her brother was breastfed by your mother has no effect on the legality of the marriage.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.