Harrassment from wife to my mother , dependent niece and my son and self

My wife is very short tempered and get existed very fast n without any appropriate reason. After marriage I have to leave separate fm my parents to avoid daily quarrel, I was having dependent niece and my wife was well aware that she would be our responsibility, before marriage I specifically appraised her and she agreed After death of my father, my mother and niece are staying with me, which she don’t like and hence trying all sort of tricks to harass them, my niece work and she also does house work quietly, she tried to find fault in her work and take up the fight, She also keep yelling at my mother every now and then and keep complaining me about them whenever we are alone or I am in office. She not even spare our only son, keep yelling and asulting him whiling studying or doing any activities, which she donot want him to do. Once, I got very much upset and took fight against her nuicence and she not only asulted me but also cut her hand making matte further worse for me. She threaten of going to police against us and put three of us behind bar. May a time , I tried to sit with her and discuss when she is in good mood but situation doesn’t remain good for longer time, small issues and she make matter big and keep shouting at us. She doesn’t stand my sisters and now they stop coming to us and talking to her anymore to avoid any quarrel. I tried taking help of her parents but even they are not taking any interest in resolving matter, just tell her on my face to adjust but never ever talk to me on the topic until I discuss issue with them. But non of this discussion work as she behave more vigorously when I talk to her parents. I hv no place to keep my depended separately nor I can afford rented house or similar arrangement. I also tried that but it works out too expensive for me. Pls guide me