Disney Cruise Line offers lots of staterooms that can hold a family of 5. Aside from the large Concierge suites that you can book for a pretty penny, you’ll find regular cabins that also hold 5 guests. Although we are a family of 4, we had a stateroom that slept 5 people with a queen bed for two, sleeper sofa for one, pull-down bunk for one, and a Murphy bed for one.  Many families also book two separate staterooms by assigning 3 people to one room and 2 people to the other. This not only ensures that you have plenty of beds, but it also gives you extra bathrooms.