The Messenger of Allah ﷺ forbade that a woman be married in addition to her paternal aunt, or a paternal aunt in addition to her brother's daughter, or a woman in addition to her maternal aunt, or a maternal aunt in addition to her sister's daughter. The younger is not to be married in addition to the elder, nor the elder in addition to the younger.
حدثنا الحسن بن علي الخلال حدثنا يزيد بن هارون أنبأنا داود بن أبي هند حدثنا عامر
أن رسول الله ﷺ نهى أن تنكح المرأة على عمتها أو العمة على ابنة أخيها أو المرأة على خالتها أو الخالة على بنت أختها ولا تنكح الصغرى على الكبرى ولا الكبرى على الصغرى
Its isnad is sahih. Abu Dawud narrated it in the Book of Marriage, in the chapter on which women are disliked to be combined together in marriage, from the hadith of Dawud, with this wording. Bukhari mentioned it as a suspended report, no. 5108. Ibn Habban graded it sahih (al-Ihsan), no. 4106, and Ibn Jarud narrated it, no. 685.