We have just booked a Family Ocean View on Independence of the Seas. Best family rooms I've seen - twin beds, a separate compartment containing bunk-beds (curtain across)and in large sitting areas, a large double sofa bed. If you go onto their web site you can view (360 degree tour.
A number of Carnival Ships, mainly the older ships in the fleet, have cabins for 5. These tend to be 2 Beds 2 Pullmans (bunks) & 1 Rollout (a Mattress on wheels). This is just about OK for 2 adults & 3 kids, but 5 adults.........Your Welcome!