I'm sorry you're going through this stressful situation. I'm like divine in that my dad was very toxic and hostile. I always had to walk on eggshells around him. I left at the first opportunity although you may not be able to. Like Divine said as well, don't let him rent space in your head and limit exposure to him

Would it do any good for your mom to talk to him?

I sympathize. Sending big hugs.