>>274237 (OP)
I honestly recommend arcade games. The kind that you can pick up easily and get sucked into. Those are still fun and much better than the modern brainrot.
Old RTS games can be fun also (Red Alert 1 & 2 aged pretty well, and I think there's an AoE 2 remaster or something now that isn't hot garbage). Warcraft 2 is not bad either.
Adventure games can be fun especially for kids who don't usually game a lot, assuming they don't look up walkthroughs for everything.
JRPG style "we all go on an adventure" games can also be appealing to kids. Golden Sun 1 & 2 for instance are pretty fun, but they'd need either a GBA or emulator. Honestly, an actual GBA would probably do kids good, since there are a lot of good old time kids' games for the GBA with real gameplay and not a lot of brainrot. Having a GBA practically encourages them to not waste time on shitty iphone stuff, but you'll want to buy them a small library of fun games (ie. Super Mario, Golden Sun 1 & 2, Sonic, Final Fantasy Tactics). If you're getting multiple kids GBAs with the link cable you can throw in Street Fighter II, Mario Kart: Super Circuit, Megaman Battle Network, Puzzle Fighter 2, etc. Honestly a GBA sounds like a really good idea. It has a lot of fun games.