question #1 Sahih al-Bukhari 5152, Book 67, Hadith 87 : What ethical considerations should a woman keep in mind regarding her co-wife in a polygamous marriage?

The Prophet (ﷺ) said, “It is not lawful for a woman (at the time of wedding) to ask for the divorce of her
sister (i.e. the other wife of her would-be husband) in order to have everything for herself, for she will
take only what has been written for her.”