@Jerry3904 awesome stuff, I'm sure your grandson will do all kinds of cool things with it in the future.
I had gotten my nephew a kit a couple years ago for Xmas, I think these things are awesome gifts.
https://www.adafruit.com/product/3728 (I didn't pay that price, got it on Black Friday).
My biggest grip with some of the SBC touch screens is that they force you to have connections hanging off/out of the sides of the screen, even when you have a stand.
The newer Pi Foundation one helps with this if you get an angled power adapter. so if you're trying to mount it as is like in a wall or something its pretty good.
But again if you want to put it in a stand or case that holds the screen, the makers of these usually put the Pi near the end for ease of access to ports, which I guess is ok for some.
But when I am done tinkering and want it a finished product I don't want to see cables coming off the side lol.
I think the official SmartiPi Touch stands are some of the best to get, but they still have the issue with the Pi being too far on the side IMHO.
The more I use them I'm becoming a big fan of the 4-5" touch screens.