A place to meet
Batman has his Batcave. Superman has his Fortress of Solitude. Do you and your family have a place to meet should there be a natural or man-made catastrophe and you are all in different places?
If you don’t, then you need to decide on at least one place where everybody would meet.
Assume that telephone communication is out, including cell phone. Where would you meet? Where would be your Fortress away from your home?
Unlike Batman or Superman, this will not be a place where you will stay (though I guess it could be), but a designated place you all know to go to should there be a calamity large enough to keep you from returning to your home.
You might also want to have a backup for this meeting place, in case this rendezvous point is also destroyed.
After all, the calamity might just happen when you are at work or school.