land possesion without kabjedar

sir, we have some agri.land in possesion.history of said land is as follows- A buy land to B but not giving kabja as seen in mutation.due to absence of kabja B's name goes in ettar hakka.again B buy same land to A & C half-half. as buyer name was in ettar hakka, C's name goes in ettar hakka & A remains in as kabjedar.after A's death his sons name come in kabjedar column & C Also dies his name till is in ettar hakka. i am the grandson of C & we having possesion of land since last 50 years. how to claim ?