3 uncle Took fathers property after his death.

Hi all.. I am alone child of my father who passed away in 1984. I had 3 uncles and 3 aunts along with father who was youngest of them. My matter is against my 3 uncles who took fathers land after his death as inheritance. Along with that my grand father's land also divided within 3 brothers without involving me and my mother in division and mutation was opened after death of my grandfather who passed away about 10 years of my father's death. My mother was with my materials who had no consent that time for anything belongs to my father. And till 2015 we had no news of transferring my father's property and division if my grandfather's land too. Third case is my father purchased 5 residential plots allotted by gram panchayat in begining of 1984. 1 plot was given to me from it to secure my marriage. This plot was sold during my marriage to cover expenses. Other plots were nearby to thst which were taken and sold by my uncle without my knowledge. I contacted gram panchayat with papers of my single plot which I sold some time back, to get details of plots allotted to my father. But they said all the documents before year 2000 were damaged by termite in old registrar office in gram panchayat. I would like to know how can I get the details of other plots to claim my legal ownership and dissolve the sale deed which was done by my uncle ilegaly. I need help to proceed legally to take back my father's property and take share from my grandfather's property too. Need step by step procedure to resolve my matter.