My wife and I share a KeePass database for all of our credentials, including the keys to our digital kingdom. I also thoroughly document our LAN design, server setup, and general maintenance notes which, like KeePass, are also shared to her via SyncThing. I also add notes to the KeePass entries, pointing her or my son to the appropriate note file for more info. I will also hints like, “this is the password that decrypts our file server drive…to do this, open a terminal and paste the following…”

She is comfortable pasting commands into a terminal when necessary, so if anything ever happens to me I am confident she will at least be able to access our data, and move it to a more user-friendly or accessible format.