You can’t deal with something compulsive. Everytime you forgive these creatures, they come back. Forgiveness works for mistakes and not for compulsions. So, no way you can deal by forgiving them. Just think that they were once who faced these things and abuse is the only way they can love you, despite the fact that abuse only causes disorientation and malfunctioning of your mind. As soon as possible, you have to get some evidences for the abuse to be occured and once you get about 3 or 4 of the tough ones, try to get a job and go away, keep healing yourselves and along the way never ever try to contavt them, it will land you back. The indian government and its judiciary is so immature to protect their own children from abuses but when, these abused ones make crimes like rape, fraud and violence, then ofcourse Indian Judicial System becomes so strict. You must keep those evidences otherwise, they may get back to you by using the Senior Citizen Act and so sad we don’t have such thing for children or teenagers. Your relatives and friends can never empathize you, they will surely drag you back according to Indian theory that says: Parents are Gods. Somehow after you get a job and run away give yourself some time and also stay away from such creatures and never try to help them. Look them as a poorly nourished tree, just think they were not loved enough and move away.

As of now keeping your exams in mind its better if u can shift to a hostel..talk to your mother softly and try to sort out things.. U can consult a psychotherapist for a family therapy along with your mother and sibling if needed.. Needs detailed evaluation

This is a common issue. Hi please consult a clinical psychologist or counsellor. Some of these could be addressed using family therapy sessions