Part of preparedness is including this contingency.

My job is to make sure that my wife and child are safe and taken care of.

I would be lax in my job if I didn't have mechanisms in place to make sure they will be physically ok once I die.

They can't survive/cope/thrive very well if I leave everything in disarray.

Same is true for me if/when something happens to my wife or child. My coping ability is going to be severely compromised. The smoother the legal/financial transition, the less stress to contend with and the better my chances of surviving.

Plus, having your affairs in order is necessary for plain, old, non-fatal coping with disaster... finding birth certificates, house insurance, having to pick up and move quickly to take advantage of new job prospects or to avoid local deterioration (economic, social, armed idiots hell-bent on un-pleasantries). Having to pick up and fly to Mexico to bail the youngun out of a Tijuana jail, etc... You know, mundane type of stuff...

My blueprint for this is my in-laws. They packed up and lived in their motor home for a couple of years. Traveling where they wanted, when they wanted. They had to slim down the operating functions of the household so that it could be mobile and easily accessed. The logistics of running a household/finances on the move has to be organized and efficient.