my name is Naveen my adopted father died recently in my house at the time I'm not in the house so af

my name is Naveen my adopted father died recently in my house at the time I'm not in the house so after that I came the house but my father death is a mystery because after the death of my father my grandfather second wife sons came and occupied my house they fastly burial my father body and warming me you're not the son of my brother don't come here like that they talk. 1. my father's death is a mystery 2. occupied my place and house 3. local police station people also help those people because of my support and that station ci also I meet him he doesn't listen to my words and he says it's a civil matter proof of documents I have 1 .adhar card 2. ration card 3. family member certificate 4. death certificate of my father and mother 5. all education documents 6. rice card 7. current bill and house tax in my father's mother's names I need justice for my father died as well as I return my house to me they occupy nm y house and theft in my house and also kill my father help me