Abusive Father/Husband

I am an 19 year old girl living with my parents. My mother is a simple housewife and my dad has worked multiple jobs, I'm writing this in order to take a step towards bringing justice to my integrity and my mother's life. Which is both on stake right now, even after living off in Mumbai since my birth, I have never once felt liberated. Mostly because I was never taught how to take pride in freedom, my parents are married for 22 years now and all my mother has ever experienced in the marriage was a failure of love & connections, lack of affection, lack of finance every now and then, no privacy, no respect and most of all hatred and torturing physical, mental and emotional violence. She has endured a lot more than one can think of and she has been living in this failed marriage for years just for the sake of her children, both daughters. I am the eldest one and I have a 9 Yr old young sister. From as long as I can remember, I have always witnessed my dad assaulting and insulting my mother. He has a background of mental illness, Marital affairs and abusive childhood. Despite all of this he has convinced himself and is believing for years that he's strong enough to get through it all which he has as per what he thinks but this attitude has been affecting his personality as well as his kinship. We have been suffering his episodes of outbursts and rage for years now and It has worsened to an extent where my mother could lose her life any minute now. Due all the pressure and stress she has been captured by various health issues which is Making it difficult for her to live a long and happy life ahead. I can't watch this dreadful turn take place and I want legal support. I am still a student in my first year of B.A and I can't ask my extended family to support us if we move out of the house. Neither am I working or earning enough to support my mom and sis if we leave my father and his home. Recently, my father has been into some shady business I don't know much about and he is also earning well, since he is the only breadwinner of the Family my mom is hesitant to take any further action against him like filing an FIR. My father's behavior has done me no good, I have been suffering from extreme anxiety attacks due to ptsd and I have lost confidence in myself therefore I have a drop out from clg this year. My family status right now is just Making my life hell...