Threatening to acquire my land illegally

I reside in bihar and one of my lands was being cultivated by my uncle for the last 10 years. However, the land is in my fathers name, we came to know this when the land fell in new highway construction and govt released cheque in the name of my father. My uncle told my father that its a "confusion" and that land belongs to him. It was extra land that was put on my fathers name by mistake. My father didn't check the papers and gave the cheque to my uncle. There is a construction of highway being done on that land now and the price of lands have increased. After few days, we checked the papers and found that all the lands were divided equally and my uncle is a liar and was taking advantage of my father's love and trust for him. After that my father told him that the land was not extra and it belonged to my father. My uncle started threatening him that the consequences won't be good and he would break his hands and legs if he does not transfer the papers on his name. We consulted gram-panchayat, and after many days of fights, panchayat gave the verdict that the land should be divided equally between two parties and that the money my father had given to my uncle should also be divided equally between the two and my uncle should return half the money within the stipulated time. It was unfair decision taken by panchayat because my uncle has influence over gram panchayat members and he was threatening my father even in front of the panchayat members. During the stipulated time, my uncle didn't give any money to my father and my father as usually started cultivating the land. Then my uncle's son threatened my father not to cultivate the land. My father told him that he has not followed the orders of panchayat and he has no claim over the land. Moreover the papers are still in my fathers name, so he will cultivate the land. My uncle’s son started threatening that he will poison all my lands and break my newly constructed kitchen, which my father didn't pay heed to. Now during crop cutting my uncle's son once again threatened my father not to cut the crops else he will beat my father. My father didn't cut the crops for the fear of being beaten(my father is already above 60). He went to the police but the police also came and did nothing. They told to solve the matter within the panchayat only. I don't want to go to panchayat as the panchayat is not taking fair and unbiased decisions. I want to move to the court against my uncle and his son. Please tell me how to do it as I have no knowledge of any law regarding this issue. In past also, my uncle sold many lands as he is already a very bad person who wants to take others lands by force. He manipulated my father many times and my father has such a blind love for my uncle that he even gave my mother's ornaments to help my uncle to grow his business . My uncle and his son are disturbing us for the past 6 years now. BR, Satyadeep singh