My friend/business partner and I have an agreement to assist the other wind down our personal IT "estates" in the event of either's death. We're both competent

My friend/business partner and I have an agreement to assist the other wind down our personal IT "estates" in the event of either's death. We're both competent sysadmins, and we both try to keep our "home IT" pretty comprehensible. The goal, in the event of death, is purely to wind-down, too-- not to keep services running indefinitely. My wife knows what hard copies (my "death book") to give him if necessary. Until I die he has no access, but once I do he has my implicit trust. I don't keep the documentation updated as often as I'd like, but it doesn't drift much between update sessions either. A life event usually prompts updating the docs. The last time I updated was the night before going in for surgery. Besides my self-hosted stuff, I do "family IT" too. The "family IT" stuff is all documented just like one of our Customers. I made a point of insuring that my business partner could take on the family in the same way that he could take on other Customers. The goal is still probably to wind down, but it puts the family IT on somewhat similar footing to the Customers.