My boys and I played DuckGame an entire 3day weekend once. I set up 2 TVs so we could team up in Fortnite with a PS4 and a Switch, but honestly we played DuckGame more. I spent this summer with my 16yo playing Divinity Original Sin 2 coop split screen. It was fun until Act 3. Can't recommend it, but ymmv.

Oh, when my kids were little we put a lot of time in Amazing Frog. And Minecraft, obv.