Neighbor Dispute Due To Difference Between FMB Area And Patta/sale Deed Area

My neighbor farming land owner who bought the land survey number is 263/1 by year 2011 having Patta/sale deed area of 120cents. Whereas the FMB area is 166cents. My farming land survey number is 263/2. The new neighbor (3rd hand) made us realized then that we have been using a corner portion land of 15cent from 263/1 for almost more than 100 years. We had been using this land for pathway for 100 years and We had buried our grand mother at the corner of the 15cent by the year 1992. Kindly note that the very first owner is of same community caste as us (SC/ST) and relative. First transaction happened on neighbor land by year 1993. The new owner is of from another community (BC) and began making problem by blocking our pathway and demanding to return that 15cent land. Our claim/response to him is that we have been using purampokku land (15cent) which is the portion of difference between FMB area 166 cent minus his Sale deed area 120cent ( ie part of 46cents of Purmpokku 166-120=46