So since the one acre is cleared, they were basically hunting on property that only you have permission to be on. Yes????

This seems like a sticky situation to me since this is a family thing. Those guys obviously feel they can hunt there. Just lick your wounds and try to get past it. Since family is involved, if you stir the pot too much you may find yourself on the outside looking in and that would really stink since it sounds like a great place to hunt.

You'll be fine.