Funny, strange but yet so real, right?
Many will say why not write a will, why not tell a friend etc..
But one needs to do this, I know we all might have our opinions, let's share and see if we can come to a uniform and decentralized solution....
This comes down to estate planning, but your approach can be something as simple as:
dump private key
BTC to cryptosteel physical wallet. spouse and childrens were given with pile of those stainless steel cold wallet and know where they were kept hidden in more than a dozen of locations to prevent search and seizure.
1) Show them how to load that into a appliance (full node) and bitcoin core android wallet to swipe those coins with a QR code generator, and
2) take your spouse and teenager is to food and other entertainment establishment and travel all over the world regularly
3) bring no money or credit card with you to where you travel.
4) Show them and make your spouse and kids to get 2 way
BTC ATM to get cash in local currency, and
5) Repeat steps 2-4 to let your spouse and kids to gain proficiency on getting cash discretely at countries all over the world.
obviously step (4) can be omitted if you have partners that you can trust and regularly referral to in foreign countries. You also get better rate that way (instead of selling with -7.. -10%, you get to sell
BTC at spot and get cash for it)