The Prophet ﷺ forbade that a woman be married to a man who is already married to her Amtah or her maternal aunt.
أن النبي ﷺ نهى أن تزوج المرأة على عمتها، أو على خالتها.
Tirmidhi (1125) narrated it from Nasr bin Ali, who said, Abdul-Ala bin Abdul-Ala narrated to us, Saeed bin Abu Aruba narrated to us, from Abu Hurayz, from Ikrima, from Ibn Abbas, and he mentioned it. Tirmidhi said, "Abu Hurayz's name is Abdullah bin Husayn." Tirmidhi said, "Hasan sahih."I say, it is not sahih, but it is possible that it is hasan, for Abu Hurayz, Abdullah bin Husayn, is disputed about, though his hadith is hasan. Saeed bin Abu Aruba became confused in his later years, but Abdul-Ala bin Abdul-Ala narrated from him before the confusion set in. Likewise, Ahmad (3530) narrated it from Rawh, from Saeed bin Abu Aruba, and Rawh is Ibn Abada, who also narrated from Saeed bin Abu Aruba before the confusion. Furthermore, Saeed bin Abu Aruba was corroborated, being followed by Fudayl bin Maysara, from Abu Hurayz. Ibn Hibban narrated it in his Sahih (4116), but he added at the end, "If you do that, you will be severing your ties of kinship." Fudayl bin Maysara is truthful (saduq), but this addition of his is anomalous (shadh) and unsupported by anyone else.However, Abu Dawud narrated in his Marasil (197) from Isa bin Talha, who said, the Messenger of Allah ﷺ forbade marrying a woman alongside her relative for fear of severing family ties. Its narrators range between trustworthy and truthful.As for what is reported from Ibn Abbas, "that the Prophet ﷺ forbade combining a paternal aunt and a maternal aunt in marriage, and combining two maternal aunts or two paternal aunts," this is daif. Abu Dawud (2067) and Ahmad (1878) both narrated it through the hadith of Khaseef, from Ikrima, from Ibn Abbas, and he mentioned it. Khaseef is Ibn Abdul-Rahman Jazari, who is disputed about. Ahmad weakened him and said, "He narrated objectionable hadiths." Nasai said, "He is not strong." Abu Hatim said, "He is decent but confuses things, and there has been discussion of his poor memory." Ibn Hibban said, "He was a decent, jurisprudent, devout elder, except that he erred frequently in what he narrated, transmitting alone from well-known narrators things that no one else corroborates, and he is truthful (saduq) in his narration." The summary, as given in Taqrib, is "truthful but with poor memory, he became confused toward the end of his life."I say, among what he narrated alone and erred in is his statement "combining two maternal aunts or two paternal aunts," for no one corroborates him in this. Abu Hurayz contradicted him, narrating it from Ikrima, from Ibn Abbas, without mentioning this phrase. So it is objectionable (munkar). The scholars have found its meaning problematic, and each has interpreted it differently from the others.