Deed Question

I wanted to know if a deed copy that my uncle printed would hold the same power and the actuall deed. What has happeded is he made his own copies of a deed to the land. From what i have been told by a friend is that my uncle is trying to buy a mobile home and since he has not put up any cash he will then have to put up part of the land as colateral. Which was as far from what my grandparents wanted. The originall deed lists my grandpa and grandma as the property owners however i wouldn't put it past him to say that he is actualy my grandpa as they share the same name "Sr., Jr." Grandparents wanted to keep the property for the whole family and all of use grandchildren swore we would never sell it or use it as colateral.

Do I have any course of action to stop this?
Please let me know

Why you want to stop this ? what you actually want