Mental Harassment by my father

I have grownup in a joint family and as a child i was so close to my father. i remember the blurr memory of getting beaten up when i was merely 5 years old with lots of stuff badly and end up bleeding or swellon different body part but then i thought that it must be my mistake only and as my parent my father have whole right beat me and this happened till i was in my 12th standard. over the years growing up i remember, the way our family was potrayed as a perfect family and my father as a perfect father from outside but i know whats the inner truth. After a certain time, i started realising that my father have started mentally harassing me, my mom, my brother and my nani. He just loves money. and hence just to mention, he have only 0 to 2% contribution towards my education, my lifestyle and my career. At any day he starts abusing us all and there have been many such incidences even where we didnt get food to eat. But his family potrays him as best father and husband. Day by day this have become severe, he literally end up abusing and metally pressurize us. My mother is the only earning member in the family and as a teacher she just earns 15000 and my father does othing but demads money from my mother. other disputes are property land of my maternal hometown, his abusive,sometime violent nature and he uses different tactics to harass my mother, nani and us siblings. mental harassment is increasing day by day from his side. when we tried to confront him for the same he and his family they denies it by saying that he is just thinking for our welfare. is this the way of thinking for welfare 1. i am not able to focus on my goal as he is pushing me towards many things in an abusive and mentally and verbally harassing way. 2.do nt support at all financially either at home or for our education or healthcare 3. he demands money from mother 4. mentally, emotionally and verbally harass my mother and maternal grandmother because of the maternal home town property. my and my brother career are at peak.... i really dont know what to do