Stay patient with him, have him sit down with you to watch Floyd fights, have him mimic a couple of 1-2-3 combos slowly. Always keep in the back of his head the importance of a jab and how the jab is a punch that sets up bigger punches. Tell him to not just throw the jab, follow it up with something else. It looks like i'm going fast here but you know all of this takes time. Baby steps until he learns the basic fundamentals, don't go hard on him or force him. Show your interest in boxing, sons mostly want to do what their fathers do.
For now just make him throw a lot of straight jabs and right hands. That's what I do with the kids. I don't know what else to say, it's much easier for me to be there and see what he has and correct his mistakes. Take good care of him and keep him interested and hungry, give him little goals and stuff. Good luck.
Hey Larry it's Kev. Just read your thread about your son starting training today. I want to respond here personally.
I don't have a son, but I have trained at a boxing gym where I have stopped my training a lot of times just give a couple of kids a couple of pointers and I enjoy teaching kids what I know about boxing.
First of all, stay on him like white on rice with boxing videos/matches. Make sure you have boxing on your TV, youtube, trading block fights at all times and show him that you're very interested in boxing. Hit the gym with him when you have the time, always have your game face on when he's looking at you train. Show him your support, he's gonna need it, kids get discouraged when they think their father's don't believe in them so make sure you teach him the right moves instead of complaining of the wrong moves.