I’m not asking which Distro would you install for your parents. I’m asking, which distro did you (somewhat) put your relationship on the line for, with your parents?
Please list any frustrations or deal-breakers that made your parents give up on that Distro, and go back to Windows or jump ship (from a PC altogether) and get a Mac.
I’ll go first. On my mom’s home computer, I set up Linux Mint. The solution I solved in her life with it, was how to sync her client files at work, to her home computer, so that her home computer acted as an offsite backup for said client files at work. By solving a problem for her, that made her want to keep Linux installed. Linux Mint has been installed for her for several years now.
As to my Dad, things didn’t go as well. I installed Linux Mint as well, but this time, I didn’t find some (non-trivial) problem of his to solve in his life. So he went back to Windows about a half-year later, then later after that, got a Mac laptop instead.
His problem which ended needing to be solved (and I was far away, so he didn’t ask my help), was that of how to transfer his photos from his Android phone, into his Photo app on his laptop. Had I been around, and had he asked me, I would have set up Syncthing to do the job (and I did set this up later to sync between the Android phone and the Mac laptop). He was frustrated that by connecting his Samsung Android phone to his Linux laptop with a USB cable, some app didn’t offer to import his photos. That worked for him previously in Windows, and he thought this should be a normal thing which should “just work”.
So word to the wise: if you want Linux to stay on some computer that you install for someone else, you need to solve a non-trivial problem in their life, and set up some kind of a workflow for them.