Seems like its been going on for a while. Mom will not accept her and the son ain't going to do anything about it.
But if I really don't want to do that.. Girle.. I'll try to find out WHY the mom won't accept.. a certain trait.. behavior.. background.. habits... education she doesn't like??? There has to be a reason. Even if you forcefully enter their house, you won't get the respect. To me personally, that is important.