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Vanilla OS 2 Orchid - Stable Release
(vanillaos.org)
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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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I don't know how old your father is or what they do on their systems. However, for elderly people, for which I just want to setup the system and forget, I tend to go with Endless OS. It's more limited and more mature than Vanilla OS. But, if that's exactly what you want, I'm simply unaware of anything better out there.