[quote=captcha]Keeping my mouth shut while he’s playing other kids is hard.[/quote]
It is super-important to do so (keep mouth shut), though.
Hard to explain how important it is to learn by failure. Better to keep track of the moves and go over the mistakes after the fact than to help them.
One thing you can do w/ your kids is switch places every 8 moves or so. You start as white, then switch to black, then back. You get to see your own weaknesses this way.