my maternal grandfather sold 45 plots before 25 years one by one also some times 2-3 plots to single owner by registered document at the time of selling some buyers asks credit like 10k to 20k but that is not mentioned in registered documents ,also possesion for such plots are still with my granfather ,buyers does'nt registered mutuation of titles for 2-3 plots now when we ask money he denies, so can we register mutation of my granfather for titles ??? and resell that property??? possesion is with us means plots are open no one is there on plots also many times my GF paid taxes for those plots .All plots are sancationed and done NA on 1985 ..please guide .