Great thread. I am in the process of building a continuity book for my wife and sons for just this reason. I would also add to that list any routine household maintenance items that need tending to (air filters, water softeners, sprinkler systems, etc...), water mains, breaker panel, garage door openers... Don’t take it for granted that just because you know about these things that your family does or will remember to check. Also, vehicle info.
Oh that is good advice. My brother-in-law had just purchased his house and we are going to sell it so we dont really have a maintenance list. But I can see how this would be very helpful for the survivors, even if there was a need to sell the house.