i'm glad your mom is smart. some women stay with beaters, which is wrong if you have children.
It is wrong and dangerous either way. No reason to stay with someone who abuses you really. I have known women that for some reason do stay with men who beat them, and they aren't even married. That makes no sense to me.
My brother's ex-gf would get drunk and hit him lol. He would just leave her there and drive home. To her defense, he is the biggest a-hole and buttonpusher I have ever met in my life.