Respecting one's abusive father
Q: I have a father, he is a worst creature I have ever seen in my life unfortunately. He always abuses us, my mother, his own mother while talking to us almost 7/10 times. He never spends a single penny on us apart from studies.
I am 25 years old and I have seen the emotional torture for the last 25 years. He used to beat our mother, I wish with a dare, I answer his nonsense infront of 10 people, but my mother stops me always saying that he is my father. She actually covers his psycho behaviour.
Some time from now I will get married and I dont want my wife to see such evil stuff, and my children as well (in shaa Allah).
Whenever I think of taking some legal and respectful action against him, to settle down things for atleast me, I am being stopped by my mother in the name of Islam. I want to know my Islamic right, how can I save myself from emotional torture?
We did a medical test for his brain (MRI), it came fine perfectly, the doctor says he has now multiple personality disorder, but I don't agree, since he has been the same person from day 1.
I want go away from him to save myself, and in shaa Allah my future family. Can I do this in Islam, because I am always being stopped in the name of Islam.