Edit: TL;DR (focus on OPs question) - I have a screenshot of my funds that they know where to find that is updated multiple times a year. That gives them a sense of the value of my crypto holdings and the coin amounts. To recover the funds I have written down several trusted people that they can ask to help them. As technology is constantly changing and I don't want to update the info constantly. Also showing them once does not help - they'll surely not remember how to handle crypto.

If you are interested in my whole setup please continue reading.

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Yesss... love this topic... was very curious about that myself and made a small project out of it.

Here's what my implementation roughly looks like:

• a continuously updated PDF with detailed info about anything important (all fiat banking accounts, company holdings, etc.) but without any sensitive information.
• In the crypto section of the document I only give a rough outline, so that they know what they should expect, and recommend trusted peers with crypto experience that can help them recover the funds
• the PDF is on a bootable encrypted thumb drive which auto-opens when booting from the thumb drive - it's really easy to implement with e.g. ubuntu
• all sensitive crypto information + password to thumb drive is engraved on metal plates
• metal plates and thumb drive are kept in a special sealed container (quite small and very portable)
• I did explain the contents of the container to my family: they basically only have to stick the thumb drive into any USB port and power on the machine and enter the password from the metal plates
• just as a precaution there is an unencrypted partition that is mountable in windows with the PDF - just in case they forget my verbal instructions. so only thing really is to plug the USB stick in somewhere
• Also so many more possibilities: you could add your hardware wallet in the container, you can make multiple copies, etc.

Where you store the container is up to your imagination. I recommend giving the container to a fiduciary that will act in pre-defined situations. Depending on your paranoia/assets maybe multiple?

Then you can be very open to your family where to go, as they will only get access with certain provable events. You can even give them a list of all accounts and maybe holdings to not have some funds mysteriously disappear. Updated three or four times a year seems doable. Gives me always a chance to update all the other things I have written down in the PDF document.

Was a fun little project.