we actually have PS for 11, so do you think one more will be a problem? As for our room we have 4 in our room, the other couple has 5 (2 adults, 2 kids, 1 under 2) and their parents have only 2, so we figured if we registered him to the room with only 2 and ask for a cot before we get there he can just stay with us making us 5, but them not knowing, thinking he's in the other room