That's all very, very sad.
I know that this is a bit off subject, but if your mom has her name on any of the bank accounts, etc., that your father has, she should take her half of it out like NOW, and certainly before letting him know that she's going to do it!!! Let her put it an account in her name only. At the very least, she should get as much hard copy proof of any and all assets, even if they're just in his name. If she actually does leave and if she goes for a divorce, that kind of stuff might prove helpful to her.

As for you, I'm so glad that you intend to go to your grandparents' house. No one should be living with a man as sick and abusive as your father. What a difficult life you've led.
If you aren't in any kind of therapy right now, I hope that will consider going. All those feelings of being worthless and disgusting, etc., are pretty much what results from being brought up the way you were. They're false beliefs. And they're the KIND of false beliefs that therapy is very effective in correcting.

Wishing you and your family all the luck in the world. I'm very glad that you are getting out of the environment that you are in right now. It's worse than just unhealthy. It's downright dangerous.

I hope that Seroquel works out well for you!!!! It's a very effective drug!!! (((((Hugs)))))