Basically my dad never upgrades his computer, I have automatic updates on but OS upgrades aren't done automatically, so I wanted rolling release to get past that. What's the issue with rolling release?

Makes sense since there won't be any release-upgrade process every 6/12/24/whatever months. You'll still have obviously have updates though.

Asking since none of the examples you were considering are actually rolling, it wasn't clear what you're after.

Yes but those updates can be automated, right? I'm just trying to avoid the release update.

Sure and sounds reasonable. Then you will have to force reboots Windows style - having the same old kernel running for months or years on an online desktop can be hazardous if he never shuts it down.