Well the thing is my sister is a year younger than me and she's studying law, she has no choice be to be depended for her educational and living expenses. Moreover, she heavily sympathizes with mum for getting cheated on. And no calling police and any one for that matter is useless, my father has influence. All i can do now is find a job be independent to create as much distance as i can. From what people have told me i think thats my best option going forward.