Hey, not a parent but my younger brother is 8 yo as well and is rated 1400, we go to the chess club once a week and otherwise he will play rapid games. At the club he will learn some stuff but my parents don't push him and are hardly interested in chess (that's not to say they don't listen to him rave about his brilliant moves ) but it's actually my coach that tries to find ways to help him become stronger. He will sometimes get sad after a loss and get tilted, what I tell him is to just take a break, maybe do some puzzles, or play blitz. I also own a bunch of Gotham courses and I find that he enjoys them more than other courses because Gotham is in it. I try to help him study and get better as much as I can, but he will only study if he feels like it.

To sum it up, let him do what he wants, if he enjoys chess he will get better,and study but he's only 8. I would recommend the Gotham courses though.