Will you be driving or flying? As a pp mentioned, you could look into the Disney Springs hotels or some of the other options that have more space for the five of you.
For onsite, you could look into a suite at AoA, book two rooms, book a mod that holds five, or try to rent DVC points for a studio or 1 bedroom. The values are under 300 square feet, so it might feel really cramped, even with just 4 people. Five exceeds the maximum, though. If you are just using the room to sleep, go with the least expensive option for 5 that causes the least hassle with transportation.