Property Dispute

My father died in Jan 2017... In terms of property and savings, he had the will of parental family and his small portion of land on papers in his business (He has two more brothers in business involved), And the firm name is under proprietorship and his name is not involved on papers.... After his death, our house papers got transferred on my mother's name and after 8 months, I lost my mother too...Then the papers automatically transferred on my and my sister's name.. My younger sister is disabled, so currently i'm in the process of taking guardianship, so that I can sell that house property located in Gurgaon. And currently she is residing with me in West Delhi with my in laws... For the share in Business - My father's brothers says that, since your father had spended money in your marriage, your studies..So his share in the business is not left and you have to trust us on this, as they also have to pay their loans in market which they have taken for doing the business... I'm not clarified at their statement, since they are family and I don't wanted to go through legal actions..but they are just not ready to give any proofs, which they don't have... They are also not giving me any monthly expense for my disabled sister, like they used to give to my mother.. Please help and guide me further on above query..