Well - I have four kids and they only make me get one room since they are small. I always price the room for 4 adults on orbitz or expedia and then call the hotel directly to ask if it's OK. We usually get a room with 2 Queen sized beds and a roll away cot. The little three sleep in one bed and the oldest gets the cot. It's really up to the hotel and the age of your kid. I usually ask them with one would they like to sleep on their own - the 3 yr old or the 7 yr old? I haven't run into any problems yet. :)