Probably an unpopular opinion on here, but the OS I recommend for grandparents and parents is ChromeOS. It’s so locked down that it’s almost indestructible, and they almost never need any specialized software that you’d use Windows/MacOS for. If you’re savvy enough you can also use Linux on it in a container, which is how I prefer to use it for day to day stuff (in my case, data related workflows).
IIRC you also hear about Gortash from Councilor Florrick in the Last Light Inn. She says she’s going to ask him for help against Ketheric.
I also remember reading about Gortash and Orin while rummaging through Ketheric’s things in Moonrise. They definitely were not featured prominently but they were hinted at if you go looking!