Uncle physically & mentally torturing and giving life threat

Hi, my name is Ankita. I am living with my uncle's family in my grandparent's house. In my family we are three member me, my sister and my mother. Earlier only my family was living in the house but 1 year back my uncle also started living with his family. From then it all started. My uncle has a criminal background so even on small issue, my uncle and aunt started mentally torturing us regularly.They regular abuse and use very bad words for me and my family. They have even try to hit us many time. They slapped and pushed me very badly once. They have even given us a life threatened by saying he will murder us all. Since they is no male in my family and I don't believe that police will do any harm to them. So till the time I have not launched any FIR against them. But the things are getting worse now. They have become more violent and do mental torturing everyday. I don't have anyone to back me up. I can't even concentrate on studies for a single second. Kindly give me any life saving s