If shooters, beer visuals, and light swearing (think damn, shit, the voicelines are pretty rare and can be disabled with mods) are alright for your kid, check out deep rock galactic. its on steam as well as xbox, and is a 1-4 player coop mining and shooting game where you collect minerals and shoot the ant looking bugs trying to eat you. its incredibly fun and ive sunk over 2500 hours into it without feeling for even a second that any of it was predatory.
give endeavouros a try. ive been using it for games on my amd system and it runs like a dream