What should be the solution to this abuse

This is regarding my father who is a lawyer but never goes for work he just go the position and live in home as an unemployed person and my mother is breadmaker of our family.Him my mother and two daughters (the one who is writing this is one of them) the problem is he is a drunken men when we was not even born he started torturing my mother mentally and physically also. He barely lives as an advocate for 3 years maybe and always drinking and abusing my mother sometimes it's false allegations and some times he physically abused her not let her talk to her family side. Maybe sometime he didn't drink but it was like only when he was ill. Always shouting and saying abusive words to her.I just can't imagine what my mother goes through the time when we was small and the struggle was she was a teacher she have to go for about 11 km daily to school. Now for about 5-6 years he started drinking from morning to evening always on drunken mode it has destroyed my mother and our both siblings mental health complete. still he doesn't earn and still drink and abuse us only when he got sick he stops drinking which takes about 1 months and then again repeating his habit. *Main points* 1. He did fraud with my mother LIC fake signature and took everything. 2. He plays Juaa and satta ( no evidence I have but maybe internet history) 3. Took money from his children's (our) account because he must have lost in the game 4. Always threatening that he will goes to my moms work place and ruin her reputation by saying absurd things 5. Abusive language to children and wife 6. Taking half rent of tenants 7. No contribution in paying anything for household and fees to everything which cost money in this world my mother has paid 8. If he is sick then it is also our fault. 9. What we have done from our side (mom and us) we also started shouting and fighting vocally that you don't earn and always drink abuse us or not making food for him. Left home away from him for two times but he can literally touch our feet say sorry took us back home and stay good for one month and again abusive as always. 10. I really want my mom to seprate from him but she is so loyal to him and loving she just co-operate all times and afraid of this society what will the think or do to us both daughters. 11. We don't have anyone else jus mother and two daughters who is trying hard to co-operate but I'm literally shaking and trembling cold hand and feet full of anxiety and recently My mother also felt a little attack like something because of shouting or anxiety Please tell accurate things what can we do everyone says the solution is to ignore and co-operate but its ruining our health and career we can't study because of all this stuff happening. And the thing is can He pull any string because he is an lawyer even we if take divorce or report him if we live seprate he may come there and not let us live or a threaten to my mom as she goes 11km he may cause harm to her What can we do ?