Next time that happens make sure he knows who you are. He has permission and your extended family owns the land right? Tell him that and also tell him people that act like this on our property have very few days left on OUR property. Then explain that you think its great that he's got his son out there ....... but you are also introducing someone new to the hunting community. I'll show you respect when you show me the same.

I would then tell him he was done for the day. Next time call me and tell me where you are going to be so I don't ruin your SONS hunt and you won't ruin my GF's hunt. Have a nice day.

Thats just me though. I don't own land but hunt on others...... If I don't show respect and try to work with other hunters....... I'm gone. There are 2 different groups that hunt this land. We have each others home #'s and cell ph #'s so we can communicate.