What do I do if I am having tough phase of my life and want to head divorce?

I am married in India. My mother in law has been brainwashing my husband since and is the reason behind all the fights, which my Husband recently is never accepting and incorrectly supporting her since she creates lots of sympathy. She has been trying to get us separated by many tactics and playing behind. I want to punish her. His son has also physically assaulted me at times of arguments, which I had never logged complaint against. How do I prove that since currently, I have no proof against? My family and I have been extremely supportive towards my husband, be it in his career or personal but we never got the respect for that in true sense. I have never got any help from my in laws but they are interfering indirectly by not communicating with me and brainwashing my husband in matters concerning us and our life. Please advise me and help me expedite the fight against injustice.