How to get our part of land ?

I had grandmother died without will and on 7/12 name of owner is of my big uncle ie eldest son of grandmom . There are 3 sons 2 daughter. I am the smallest son's son. Since my big uncle's name is on 7/12 as owner,my question is how do my father get his share. What should we do.Should we go to court . There is a thing called tantamuktee kendra but it requires sign of people name shared on 7/12 since it is hereditory land it has so many names so it is not possinle all to be present at one time in tantamukthee kendra.Our land is in junnar,Maharashtra. And for a meeting my big uncle doesn't come and sits with my father and middle uncle. His son argues on decisions and creates problems he is quite rich workingin IT industry along eith his wife.They took our home which was hereditory without giving share to my father. Tell me pleaseee what to do . There are so many bad peoplein this world like my big uncle and his son. My big uncle reads many god books but he is notequivalent to a single good word from it. My middle uncle's son died from dahihandi in mumbai. Even he got share in that home but my father didn't we coild have get stayed from court while that big uncles son did but we didn't we don't want to fight we want it peacefully. Pleaseee help.