How to transfer property from my father after death?

My father passed away in 2009(only son). After his death all the documents were taken by his brothers forcefully in order to make it difficult for my mother and me. We don't even know what documents were taken. The property is a plot of land and a house, which was mortgaged for a home loan. We paid out the loan and got documents(original) from the bank. I am not sure it it's the deed but it's a legal document stating that the land and the house belongs to my father.(This document also contains details about what properties my uncles own). Now I have no other documents regarding this. I have three questions. 1. How do I transfer the property in my mother and my name(only two legal heirs), having no other document than the one received from the bank? 2. Can my uncles create a problem in this process with whatever papers they have taken at the time of my father's death? 3. What other documents should I procure (and how?) in case I want to sell the property at some time? P.S. We have been paying taxes for the land to the panchayat and house and have those documents.