Sulayman ibn Yasar سليمان بن يسار مولى ميمونة بنت الحارث · The Book of Marriage

"We have been saying that you want to marry Durrah bint Abi Salamah." The Messenger of Allah said: "As a co-wife to Umm Salamah? Even if I were not married to Umm Salamah, she would not be permissible to me, for her father is my brother through breast-feeding."

"A woman should not be taken as a co-wife to her paternal aunt or her maternal aunt."