I had the same problem with a guy on my families land... the only thing is, he would hunt my stand when I'd asked him not too, he would leave bottles of PISS and cigarettes in my stand, and I was constantly finding .30-06 shells all around the base of the tree my stand was on. My family, being the good people that they are, wouldn't do anything about the situation. In fact they would find it funny when I would tell them my finds... I have since stopped hunting there at all.

Kick this guy out.