RE: Someone else hunting in my stand...
Alot of the guys here say to confront the trespasser but it's obvious that your Dad doesn't want any problems with the neighbor and probably in not so many words has given him the ok to hunt.........I'd go with with the option that hasbeen suggested here several times. Yank that permanent stand down and get a climber that goes home with you. I have the same situation at my Dad's. Sometimes when I go to our target range there I see someone hunting....I chuckle when I start blasting away. The deer never go far but it sure gives his neighbors who have permission a plate full of disgust, eventually they get the message and find somewhere else.