I don’t know about the bug in particular but for the next time when/if your system hangs and seems completely unresponsive:

I recommend looking into the Magic SysRq Key, it shares the same button as print screen on the keyboard.

Depending on the keybinds enabled you can kill all processes and reboot the PC, among other things. https://en.wikipedia.org/wiki/Magic_SysRq_key

I think it’s probably also because people leave lemmy.world and lemmy.ml

Since you mention Baldur’s Gate 3 you could try Divinity Original Sin and DOS2, DOS has 2 player coop by default and with mods you can play 4 player, DOS2 has 4 player coop out of the box.

Although depending on how old your kids are it might be difficult to play.

Someone else already mentioned the lego games and I can’t 100% recommend those as well. Lego Star Wars complete saga, lego star wars clone wars, lego indiana jones are the ones I’ve played and can recommend all of them.

Although there’s only 2 player coop.