Nope. At some point in the recent past, this topic has come up a few times. I can think of at least 1 or 2 legit reasons on why a family on or families would miss the muster drill. Usually because the flight was late or the transport they were using was late. As an example, on our last cruise on the Fantasy, after the muster drill and at 515 just before the last lines were dropped at PC, I personally saw at least 2 families running onto the pier, escorted by
DCL terminal employees to board the ship. They were last minute transfers from the Magic, who had canceled 2 cruises due to her late drydock issues. My fil and I were talking trying to figure out why we were still in port after the Sailaway celebration. We found out later that cruise we had taken on quite a few transfers from the Magic and most of the passengers were coming from Miami.
Someone else about 1 or 2 years ago, posted a letter that was left for them, under similar conditions. It was basically a 1 page summary of the drill.