Dividing the property

Dear All, We have a farm of 15 acres. 1/3 of the farm is owned by us and 2/3 is owned by our uncle. we wish to divide this farm now legally as our uncle wants to sell it off. Following are the clarifications/inputs which I am looking for : 1) The 7/12 has additional 2 names who are our relatives (they were never part of the property purchase but there name was added by our data for security) - how do we remove those names. 2) If those 2 additional names cannot be removed then can we put those names into 2/3 land which is owned by my uncle? what are the legal options to get this executed. 3)How will be the land divided? Is there any government rule to divide a farm land as it has rocky terrain as well as cultivation terrain. 4)What documents would be required to get this division done in our farm land....do we need to be physically present at the Talathi office to do so or can it be done by signing any deed/agreement which in turn can be produced as a evidence to Talathi for splitting the farm (this question is asked as one of my family member stays abroad). 5)If we give our documents to our uncle then is there any possibility that he can grab this land from us?