If he is just along for the ride and observing the hunt, no, no license is required. Where it could cross over for you though is if he "participates in the hunt". That could be as simple as you handing him your box call and letting him scratch out a few notes. Suppose he goes on to call in a bird that you shoot, someone could see that situation as crossing the line to him participating in the hunt, etc.
Personally, I would take him and I suspect that he will love it and want to know what he has to do so he can hunt himself next time.