My father and his brothers want to disown me from their property. But, I know that I have legal rights on the property (a farm) which was purchased by my grandfather and later transferred in the name of his sons (my father is one of them) after his death. I do not even know, how much land did my grandfather have? I want to have the copy of the same. I live in Mumbai but the the said farm is in my hometown. How do I go about it?