Hi, I have a notion to ask Grandpa along for a cruise sometime in 2015. We would have three staterooms for seven people: two parents and a kid in each of two rooms, and then Grandpa in the third. The kicker is that if we book it that way, Grandpa has to pay double fare. I don't want to break any rules, but could we book a kid in with him -- and then have the kid sleep in the room with his parents? No flames please. If it's against the rules, then so be it. I'll look for another vacation option.