If you’re afraid it might cause a problem, maybe you could try to say no one time (ideally at some time when you sense it’s not that important for your son, like not during a storm or after nightmares), just to see if that’s ok for him, or if that raises problems.
You can technically do this in Lethal Company, but since there’s no permanent way of communicating on long distances in game (you have to get items for this), it could be a bit frustrating at first. Maybe some mods enable it though.
I found Frieren to be quite slow, in a good way, but i think there are better options out there that i’m unaware of.
Which would make that moment around the 80s, when the Groenland population reach a relatively stable 50k and the US + CCCP warheads make a peak from 50k to 65k (excluding other nuclear arsenals)