We got the first pc in the household when I was 11 and we never sat there with 2 or more people apart from the occasional "trying to figure something out" or A helping B or vice versa. But maybe that's also because my parents were never interested in games.

Thinking about it, it wasn't much different at all of my school buddies' places - often the computer was cramped into a corner that it was already hard to sit 2 kids in front of it and I've also hardly of anyone doing this with their parents or siblings, but that's of course not a proof.