Zorin or Mint.

Zorin is a bit more dumbed down, so there is no way for normal people to do anything wrong and a lot of things work just like they would expect them to. What really shocked me is when my dad downloaded some exe from the internet, double clicked it, installed and ran the software… No other distro supports that I think. On the other hand, when he had a specific wish, there was no way to change that, even though there are other distros/de’s where I know you can. You mostly have to take it as it is given. Streamlined might be the appropriate word.

But mint is also very good for people that come from windows. No personal experience with it though.

Personally I prefer KDE over what my other two suggestions offer, but I’ve noticed that there is a lot of fiddling around involved when setting it up for specific personal preferences. If I do a fresh install, I have to go through all the kde apps and into their settings and change some behaviour here and there, which takes a whole weekend. I don’t like the defaults, but at least everything can be configured to nearly perfectly suit me. But I would not want to do that for a relative, who is not tech-savy and patient enough to do it thenselves. Thats like a constant part-time tech support job.