Once again, Mojo, a fantastic photo.
I especially love the shooting angle on this one. Perfect lighting and composition and a great story. The only thing that I would suggest (and again only my opinion) is to crop out some of the background. I realize that it would put the subject (your grandson) smack in the middle. But I think it's a strong enough photo that you can ignore the "rule of thirds" in this case.
11/12 on the elements of merit image (-1 for composition for the distracting background) Just a very endearing photo well done.