Adopted child

I was adopted in 1996 by my biological mothers aunt and uncle who are hindu's I do have my affidavit which unfortunately has not been registered everything was fine untill I lost my foster father in 2006 and right after two years my foster mother removed me out of the house and refused to take me back its been 6 years I haven't moved back I don't get any allowances from her though she has the business running and a house which belonged to my father now that her nephew and his wife and a daughter who are Muslims and not related to my foster father live with her I have tried to convince her a multiple times to take me back which she has refused to i have been on my own ever since I don't know what is my future going to be like I have nobody to depend on even in my worst situation I have had no family support for all these years. Could I fight for my rights the legal way being nice to her hasn't helped me at all I fear for my future living alone all by myself with nothing in hand I did not get to complete my graduation as well because she had refused to educate me I definitely was promised a better future by her but can I still inherit half the business and house share and I have no siblings from my foster parents I was the only child. I have my foster father/mother's name in every important documents I.e passport,adhaar card, even ration card all my school certificates as well is this be helpful?