Sweet. I started riding my kids around in the yard when they were small. Bought my son an XR100 years ago. He's 26 now, in the Air Force, and rides a Sportster. I'm trying to guide him back to the dualsport side. My daughter, now 16, wants a 'dirt bike'. Of course, she also wants a horse, so.....
Good on you for spending time with your son, doing something wholesome and letting him see his dad have some fun! Not enough of that going around....
I usually run out of talent before I run out of horsepower.
I don't like sand.