Wife Torture - Want Divorce

My wife is using extremely abusive language with me everyday. She uses extreme slangs in the worst way possible. I have been trying to stay with her since last 6 years, tried to handle each situation calmly, tried explaining to her but she does not understand. I have never retaliated to her bad language and always kept quiet. She abuses my parents and family also. Just day before yesterday she beat my mom and pulled her hair badly, who is a Sr citizen. I believe she is not fit mentally. We have a 3 year old boy. She uses such slang even in front of him, when I request her to stop so that at least our kid could be fine, she doesn't stop. I'm in a very pathetic situation. I have asked her many times calmly for mutual divorce telling her it does not make sense to live together this way. However, she's is not ready and tells me I can get the papers but she would not sign. Her parents are also not supporting divorce. I'm also worried that she may file false case against me and my family. I'm at the verge of falling into depression. She's not even ready for divorce. My kid is also getting mentally affected due to all this. I want to get away from get and live the rest of my life peacefully. Please tell me how to go about this situation.