>>44818I'd recommend either getting comfortable with gentoo, or if you want to set it and forget it, using OpenBSD (as long as you don't care about broad compatibility with soyware and just want a UNIX box).
Otherwise, pay someone to set everything up for you and keep patching everything. You could pay redhat for RHEL too if you want enterprise support and have enough money (or use fedora), but I wouldn't recommend using proprietary operating systems such as windows or macOS at all, even (and especially) for grandmas.
Proprietary software is fundamentally designed to keep the user computer illiterate, and to prevent the user from learning anything about computers.
If the users learned too much, they would gain the ability to set everything up themselves and wouldn't be locked into those proprietary ecosystems anymore.