Husband want divorce from a wife who mentally and physically torture husband and and father in law

I have been married for 3 years and have a 9 month old child out of this marriage. My mother passed away just one month after my marriage. My wife has been abusive to everyone in the family. With these abuses, over the period of time she started torturing me and my father physically also. Not giving him food, throwing away his belongings, not allowing him to use house things ( this house belongs to my father not me). She threw hot tea on my father twice. On an extreme, she once tried to set fire on my father's bed while he was sleeping. I recorded all this and then she doused it off. My father is a heart and BP paitient. He was under the influence of his medication and kept sleeping. We called the police and filed the complaint and even police asked us to tackle to matter yourselves. I kept calm and always sat to make her calm and realise that she is the single woman in house and everything belonged to her. She started using foul language to even my sisters and my brother in laws, as a result they also stopped coming. That is what she wanted. I tried hard to save my marriage thinking that she might have issues with my family but then she wasnt not good with me either. Not a single day passed that she hasnt fought with me. Just yesterday, while my father was sleeping, she entered his room, closed the door and threw water on him with bucket and started beating him with wiper. He shouted and luckily I was there and could open the door and save him. Since then he has been staying with my cousins. I did whatever I could but she is noway possible to live and deal with. We are under constant threat of our lives. She made some fake documents also to implicate me and my father that we have beaten her. Her mother, sister and brother have been supporting her and threatening us for dare consequences. Luckily we have proof that the medical prescription is fake. I dont have enough money to fight long for the case. Kindly help me. Many times, I had suicidal feelings but cant leave my father alone at this age. please help...please. HERE MEN ARE VICTIMS.