Yeah. I think you can’t go wrong with either Debian or Fedora with Gnome. I would pick whichever I’m most comfortable with. The grandparents will probably never notice.
I love to give Gnome crap for being a large install, but I’ve lost count of the number of machines that I’ve put Gnome on and had it just work. And I’ve lost count of the number of times that I’ve searched for a fancy command line way to fix an annoyance in Gnome, and discovered there’s just a simple toggle in settings for what I want.
That’s a great point. A nice Debian LTS release could be just the thing.