I think the time to be nice has long since passed. Unless he has exclusive rights to the property he leased he has no right to do it and he owes you half of the money he has collected so far. You can either allow yourself to be pushed around or you can exercise your rights to the property and force him to do what is right or sue his azz off in court. From what I can determine from your post, if you lose him as an uncle, you never had him as an uncle to begin with! I don't know you or your personality, but I would never allow anyone to stick it to me like your uncle has no matter who it is! The longer you allow him to push you around, the more he thinks he can. You should have stopped him when it started.