I mean, it's a piece of paper. They could write the name of the person on the paper, keep them alphabetized, and store and search through hundreds of them easily (let's assume they're rabbits with hundreds of children). There may be all sorts of problems with this approach but I don't think burdening parents with paper storage is one of them.
Edit: of course, if they were rabbits I wouldn't trust them with paper storage. Rabbits are notorious chewers.
Like... mass enail the PDF to several members of the family and be done with it. Can it happen that 5 people at once lose their email access? Sure, but the probability is minuscule.
Distributing digital copies of your password store to your friends and relatives could maybe work. Be sure you're using a really strong password (that you can also remember by heart), because you cannot trust each friend will store the file responsibly away from prying eyes.
Remember the scenario:
- You lost access to your recovery codes and any handwritten notes, so you better remember the master password by heart.
- But this master password better be really strong, because each of your N friends you distributed your files to is a potential leak to hackers and thieves.
- (Tangentially related: remember you have no authenticator either, so your password store better include recovery codes, otherwise without 2FA you're screwed)
What, are your parents going to be running a PDF storage service, classified by person? That's too much to ask of them (for most parents).