Several years ago I was on where not having the document turned into a super hassle or a family. It started with their flight being over sold. Mom and a couple of kids took the next flight while dad and the eldest daughter waited for the flight after that, but there was a problem and they missed the ship. The airline tried to get them to the first port to join the cruise, but he didn’t have permission to enter Mexico with her without mom’s signature. The entire trip was ruined.
this is all an effort to stop kidnapping and trafficking.
get the documentation.