Access to landlocked Agricultural property

Hi, During division/partition of 15 acres between brothers (my father and his brother), My uncle took 9 acres with public road approach and my father's parcel of 6 acres doesn't have direct public road access (30 feet road), public road is 100 meters away from our property. There are land of our neighbours behind our land to which they had a recorded (in 1977 sale deed) pathway of 15 links which runs for 1000 meters over my uncles land. During partition between my father and brother they have agreed to additional 13 links width and 300 feet length (6 cents shared between both) up to approach of our land. But the partition deed is ambiguous which doesn't clearly states 13 links is in addition to 15 links common pathway. The common pathway was then forcefully denied to the neighbours and they are not claiming these many years. My uncle now taking advantage of ambigious document is claiming path way is only 13 links and blocking the additional 15 links, which he is trying use for agri purpose. We tried amicable settlement but he is not up for it because of personal vengance. Could you please advice the route we can take to claim the additional 15 links path. Also please confirm 1. What is the minimum width of the pathway we can claim for agri land? 2. What is the minimum width of pathway required if we are to repurpose the land for anyother commercial activity in future ? Best Regards,