B.A., International Relations, James Madison College, Michigan State University. J.D., University of Michigan Law School, 1986. Practice concentrated in bankruptcy, commercial law, business law, workouts, real estate and complex situations.
A: We don’t have enough information to determine which state has jurisdiction, and the proper venue for a suit. There may be diversity jurisdiction in federal court. Consult with an attorney to determine whether, and where, to file suit.
A: Your uncle could appoint you as his agent, giving you authority to act on his behalf. This does not necessarily need to be in writing, but under some circumstances, you might want to have it in writing. I don't know what it means to "trespass the undesirables from his property", so I don't know the circumstances. If you mean to ask them to leave and then involve the police if they don't leave, this sounds like a messy situation given that your uncle's brother (your father?) is also permitted to be in the house. I can envision the police declaring it to be a civil matter and leaving without taking action, but I have no idea of the situation.