I'm struggling at this, and hence looking at your collective wisdom.
We are all selfhosting here (at least, willing to), so we know that it takes some time and skills.
But have you envisionned what your familly will do if the worst happen ? (e.g. you die in an accident)
Can someone take over, or all the setup will slowly fall appart and data be lost?
In my case, no one will be able to follow up. So all important documents and photos are mapped through nfs to all PC at home, so familly will still be able to access.
They know that everything important is stored on a NAS (hiwever, not sure they can identify and find it).
Same for all the passwords, a keepass file that is setup to be access easily and from all PCs. I have the plan to document in there an emergency way for them to secure the data.
When I die, I will go to heaven. This isn't exactly the worst.
The server itself will remain quite stable for a long time.
The others won't be able to continue administrating/maintaining the server. They understand that, so they will probably copy all their files to their local devices, sooner or later, and stop using the other services.
Well, if you assume they are able to do copies of files, and in the end they are not, you will not go to heaven because you screwed up your familly.
Same as stop using the services, they might now even know they are using some @home services that are running in the background.
But I take the idea about having them making their own copy of files, and write down some instructions ablut what is where, and how do a backup they own.