d3adb01t: https://www.gog.com/mix/games_to_play_with_your_niece Wacky Wheels, World Rally Fever, and Star Wars Episode 1 Racer might work.
I have considered Wacky Wheels before, but the Mode 7-style courses don't seem to work for me anymore, sadly. As for pod-racing, I'm saving that for when he's a bit bigger. Thanks for the suggestions.
idbeholdME: I'd say leave the raising up of someone's children up to them and keep to the topic.
I had great fun with
International Rally Championship. Probably the game I spent most of my splitscreen time on.
Rollcage is also fun with a possibility of splitscreen but may be too fast for him at such a young age.
Rayman 2 might be a good way for him to get into more complex games and take him on a charming adventure. It might require you to give him some coaching though.
POD is also a neat racing game, but I can't find a way to get splitscreen to work (and I'm sure I played it in splitscreen with my cousin)
Commander Keen series could be okay but it is quite hard (especially the first 3).
Thanks. I've wishlisted
POD; the graphic style is a bit more adult than I'm hoping for, but it does look like something I could play with him in a while.
Rayman 2 has been on my watchlist for ages (I have my own memories of that one), and I agree with you about the
Commander Keen series.
That looks interesting. Wishlisted. Thanks!