The big one is fine. I think it’s already grown up. And does most of the chores around. And the small one: I tend to bring it with me. I carry it in my backpack, especially to some nerd activities. I don’t think there is any rivalry. They’re individuals and I think my machines all feel my love and affection. No, I don’t miss them in day to day life. We’ll meet each afternoon anyways and I think some leeway is healthy. But that changes if I go on vacation for a week. I sometimes really miss them when I’m in a different city for several days… Idk. Seems one-sided anyways, because they then just sleep all day like a cat and don’t really mind my absence.
Idk if kids are a target group of Nobara Linux, but I heard that’s good for gaming.
Rest sound good. Don’t forget to give them lots of productivity tools… OBS, Kdenlive, LMMS so they can practice shooting videos, create music… They’d need LibreOffice, maybe an IDE to learn coding, or something to create a website. As a kid I had a lot of fun tinkering with the Free Software tools, next to gaming.
Test the website blocking, if you restrict for example porn. Nowadays the browsers all try to do some privacy enhanced DNS over HTTP and that might circumvent the default DNS. I’m not up to date with the current solutions to restrict usage… Maybe someone can chip in, I’m pretty sure that’s available.