How to partition the ancestral porperty among brothers when the parents are not alive

Hi, my grand father had received some ancestral agricultural land and two commercial lands. My grandfather had three sons, my father is oldest (illiterate and not alive), middle one (illiterate and not alive) and younger one (educated and alive). Here is the story. All three brothers were thrown away by grandparents after marriage of respective ones. My grandparents expired without leaving any will. In the span of three years my father and middle one also died due to health and accident respectively. My uncle (younger one) took all the documents from my grandparents house when they expired without knowing us. From then onwards, whenever I ask for to make an official partition, he always escapes with the support from village president. I get little time to stay at home due to my education and now job. Now I am staying in another country. Rest of them are uneducated means my middle uncles children, aunt, .... Recently he started constructing house in the commercial land and then we came to know that he registered his name on the village panchayat as a legal heir to my grandparents property. This is the reason he is escaping all these years from the partition. Since he has the documents for commerical property (which are not on his name but still threatening us), how to approach the court or police to solve this issue. I can take care about the agriculture land since everything is in online which he cannot change without my signature. please do suggest me.