Mutation record and registry deed

1) I need to get mutation by inheritance records of a person from whom my grandfather bought land. 2) My grandfather bought a land in 1970s but we don't have the registry deed and he didn't do mutation of land, Is there way to get registry deed if registry was done and if registry is not done then is there way possible for us to claim the land if we have been using it for more than 50 years. 3) My grandfather sold some land to X but X claims that my grandfather sold more land than we know my grandfather sold to X and X is claiming our land as his, So where can we get the registry of the land sold by my grandfather and how can we get it.