Domestic Violence by Father

Hi All, We are four members in our family, Father, Mother Me(daughter) and my brother. My father is Working and he has side business from my 10th. He wants to hire employees for his company. From there the entire drama begins. He got loss in that business and used to ask for money. One of the female employee raised her hand and helped him for the money. From then they started going for movies together & he didnt even come home in the nights. My mother Observed all these and finally saw the chatting of both of them. Because of the loss in the business we don't have water to drink in my home & he didn't pay the house rents & college fees, no food, no money . Then My Mother after seeing all these she left my father and Came to my mother's brother. From then Our father-in-law gave shelter, food, fees everything. We 3 used to stay. Right now I'm working and running my family. Again he's coming to our home and never pay the rent and fees nothing. We are not able to bare this anymore. We don't want to live with him. And he still kept password to his phone because my mother checks his phone. And the lady is 25 years old my father 46years old. If he come to home we are not able to stay it's like there is no peace. Everyday begins with Fight. There's a lot to say but I just said in brief. Can anybody explain me how to file a complaint against him and the process? Thank you in Advance