So we are cruising from Stockholm to Oslo on June 5. As per our usual, I and my father-in-law are booked into Cabin 1 and my wife, 2 kids, and mother-in-law are booked in Cabin 2. Somehow, I'm in charge of doing all the check-in malarkey. So I've got everyone's check-in complete except my wife and kids. For the onboard charges, obviously they need to be linked to my credit card, but in that section of check-in, the drop down list for who will be responsible for charges only has the adults in that cabin. I was able to link my MIL to her card, so that's fine, but how do I link my wife and kids to my card? When I'm in another cabin?