Yes, there are cabins that will sleep 4, you just have to have your travel agent find the right cabin that will accomodate all of you. Most likely you will have either/or a sleeper sofa and possibly an upper. Those cabins do get sold fast, so start checking as soon as possible, and good luck, happy cruising.
Getting a quad cabin is sometimes very difficult. I found a company that works with all of the largest cruise consolidators(who sometimes block all of the quads for their exclusive use). Internet Travel Consultant is at 877-635-0649 The good thing about quads is that the 3rd and 4th persons is at a very discounted rate.
Hi, A lot of cruise lines have beds that are pulled down from the ceiling. The room stewart will pull them down when he does the turndown of the bedsheets and put them back up in the am. These cabins usually go very quickly becase of the reduced cost. The 3rd and 4th passengers get on for a relatively nominal fee. ie 199-399 pp except for suites which the charge is usually more and they don't usually have the pull down beds but rather a sofa bed that pulls out.