How to get partition of land done?

Hey there, I have to do partition of land which is one the name of my grandfather. Problem is my uncle is does not want to give the land as my dad allowed him to use all the land but now he has become more greedy and says he wants the share of the house which is in the name of my mother and have built with home loan and all. He says that he want the my house and make false allegation that it money was given my grand father for buying the land which is not true. Again the house is on the name of my mother and no one other than my dad has paid for it. What shall I do make things go smoothly without any fear because my uncle is kind of rowdy.