How to register ancestral property in our name?

we have an ancestral house which was in the name of my Paternal Grand father. he died i n 1982, after his death, my father and my uncle (chachaji) did not initiated any formalities to get the title of the house in the name of my Grandmother. my Grandmother too died in 1994 and again they had not done any legal formalities related to the property. few years back my father too died. now i want to get the house registered in the name of my mother and my uncle. as there are no other legal heirs , besides ours and uncle's family what will be the procedure is death certificate of G. parent must