Regarding partition of ancestral property among all the brothers

Sir, my grandfather died a month before. Also I lost my father in 2005. My grandfather was having 6 children i.e 4 daughters (1dead) and 2 son (1dead--> my father). My father had two sons and my Tauji is also having 2 sons. Now my cousin brothers are denying to divide the property into 4 parts. They are hiding the death certificate of my grandfather and also the original papers of the land and ration card. They are saying that we had misplaced it. I inquired into the registration department by providing the khasa katra (plot nos) It's still in my grandfather's name. Please suggest how to claim my share in my grandfather's house. Also will partition happen only among 2 ( my father and mu tauji) or it would happen among all 6 i.e including my fua's too. Also please explain the process of transferring the house from my grandfather's name into my name?