The Prophet ﷺ said, "A man must not outbid his brother, nor propose marriage over his brother's proposal. A woman must not be married to a man who is already married to her paternal aunt or her maternal aunt. And a woman must not ask for the divorce of her sister so as to empty her bowl, for she will only receive what Allah has decreed for her."
حدثنا روح حدثنا هشام عن محمد
عن النبي ﷺ قال لا يسم الرجل على سوم أخيه ولا يخطب على خطبة أخيه ولا تنكح المرأة على عمتها ولا على خالتها ولا تسأل المرأة طلاق أختها لتكتفئ صحفتها فإنما لها ما كتب الله لها