My Parents(both Mother & Father) bought an agriculture land 10 years back along with my uncle and aunty(real brother of my father). After two year of purchase my parents bought 80% share of my uncle's land in the same plot by paying him the agreed price. But my parents did not get the portion of land bought from uncle transffered on their name and instead made a mutual agreement letter on a stamp paper. I wanted to know the procedure as to how can my parents now get the portion of uncle's land transferred on therir name which involved a minimum transaction cost.