What's your post-life plan for the websites you manage for others?

Some day I won't be around any more, and a family member relies on me to manage their work website. They don't know how to log into the domain registrar if DNS settings need adjustment, they don't know how to update the blog or pages or how to push the results (static site) to gitlab pages.

We did try Wordpress, but the constant hassle of plugin updates, vulnerabilities and login security was nothing but stress for sites that add or edit a little content once per month on average.

Hugo and other static site generators weren't professional enough looking (and are difficult to use). Publii does not fix showstopper bugs, such as broken support for syncing with GitLab, GitHub, etc.

I'm thinking that I could use Wordpress Studio to create a locally hosted site, teach them how to edit that, export the static site and upload to GitLab or similar. But honestly, they're technically as weak as it gets. If they get into trouble they won't be able to get out of it without going to UpWork.com and finding someone there maybe.

Has anyone solved this for themselves that can share their solution? I'd like to have a solution in place while I'm alive rather than leave instructions in a will.