I have a twin brother who treats our mother quit poorly but still deeply cares for her if something happens to her.

My mother has spent over 10 grand on him because he can't keep himself out of trouble and he's not grateful about it what-so-ever. That 10 thousand was her retirement fund...He yells at her like she's an idiot, he thinks because he's the only man in the house, he can talk down to her and me. He's bigger and stronger than us both (and I'm also currently pregnant) so I know for a fact he takes advantage of that fact.

I'm not understanding why my mother puts up with him. She gives him everything despite the fact he doesn't deserve it. I think it's because my brother reminds her of our father who she still loves. Idk, I just can't stand it. I've tried speaking to her about the issue and how abusive he is in a way but it just goes out the other ear. I've spoken to my father but he can't really do nothing since he does not live with us. I've tried speaking to him but he gets pissy and tried so hard to make pitiful excuses as to why when there's no good reason to treat this woman who's birthed you so poorly.

I currently live with them both until early April but I really don't want anything to do with him but I love my brother. I don't want to cut him off and regret it but I don't want his piss poor attitude in my life either. I want to protect my mother but how can i do that if she refuses to listen? I'm not sure how else to go about this.

Any thoughts and opinions will help.