I also had to steer Ollie toward more appropriate human-dog play activities. The "Thank you, Take it" game is GREAT at helping dogs learn that even play growling over stuff isn't necessary because 99% of the time they'll get their own stuff back. Offering to "trade" items also works well and RRs tend to really get into that one since they quickly figure out that they'll get something better if they politely surrender whatever it is that they have. They're both really great rainy day activities for earning treats (or an entire meal, piece by piece if it's a really slow day!).
I'll be honest. Ollie was my first dog and my first RR and I made a ton of mistakes with him. One of the ones that still bothers me is that I completely overreacted when he play growled at me and when he acted like a hooligan. To this day (and he's 9 now), he still won't really cut loose to play with our other dogs if he thinks I'm watching. Some of that is because he's the alpha of my three; some of it is because, I think, he was inadvertently "trained" not to.
Anyway, if Trapper is anything like Ollie was, his behavior isn't "aggressive" or "concerning" -- rude and a little off-the-wall? Yes, but he's treating you more like a littermate than a leader. If he behaves politely in the house, then all you need to do is gently remind him that you're to be respected in the yard, too, and playing those games will make it fun for both of you, rather than heightening any sort of anxiety or stress you feel about the situation, which would rub off on him and start a downward spiral of naughtiness.
He sounds delightful, actually.
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