If a man has two wives, and his mother forces him to fall short with regard to the rights of one of them, and he gives his wife the choice between staying with him and giving up some of her rights or divorce, and she chooses to stay with him, is it permissible for him to do that?.
Praise be to Allaah.
There is no blame or sin on him if he gave her the choice and she chose to stay, rather the blame and sin is on his mother who is forcing him to do this. If he can advise his mother himself, or through the mediation of someone whom she will listen to, and tell her that it is not permissible for her to do this, and make her fear punishment in this world or in the Hereafter, then this is what he must do, otherwise Allaah does not burden any soul beyond its scope. End quote.