How to share your wallet key/seed in case you are hit by a bus
You can accomplish all of this and more using a &quot;pay to script hash&quot;. You can even do more complicated rules like &quot;let my business partner have access to my account if either my lawyer or my wife agrees (but lawyer and wife can not together access account, so more complicated than just 2-of-3).&quot;
Here is a great chapter on this stuff...
https://www.oreilly.com/library/view/mastering-bitcoin-2nd/9781491954379/ch07.html