Abuse and disturbance among parents

I am Ayush from Kanpur, i am 18 My parents used to live happily earlier but from past few months my father started thinking that my mother is cheating on him and he started abuse and even violence with my mother in the absence of me and my little brother (15) . He is a government employee and my mother is a housewife, my father takes rest after almost every 15 days and returns to our home after 15 days. Every single time he comes home he mentally tortures me and my brother and mostly my mother. Its causing critical brain damage and disturbance in all of us. My father always abuses and says that if he will not give money to my mother she will be on road. He is extremely abusive not only towards us but also towards his own parents ( my grandparents ) Me and my mother always tries to keep the family together as we are still studying but he tortures my mother too much. Recently he tried to hang my mother and tear her clothes in our absence, we are soo much worried please help.🙏🏼