I have a related question (maybe). We are travelling with my sister and her family. One of my sons is registered as a guest in their room, due to space constraints (he will actually sleep in ours). I wasn't worried about being on the ship and getting a second key, but they just made their travel arrangements and they appear to result in an arrival time of 2-3 hours later than us. As his parents, are we able to get on board with him without them? That would mean carnival allowing him to check in without an adult in his room (but an adult on the ship). This just donned on me and I should have switched me or my wife into that room to alleviate this issue (which I still might try if they would for free, but we sail in 2 weeks). thoughts?