On our cruise next year, our TA booked my oldest son under my sister in law's reservation since she is traveling as a single, this way it saved us money. My son will be physically staying in our stateroom though. I have seen this done a couple different times. Both of our reservations are supposed to be connected so our dining table should be the same. During the muster drill, should my son just stay with my sister in law if we are at different stations? What about when we arrive to port, will he need to checkin with my SIL? During online checkin, do I recall that we need to give people permission to take him off the ship? If he is staying with my SIL will that cause issues? My son will be 13 at time of cruising so he will be able to navigate whatever he needs with my SIL. We also are using Disney transfers so we wont have to worry about port arrival times. I will be most likely be doing the online checkin for both reservations, so I can make any changes needed. What else am I missing?