Here is some info:
A family of 5 or larger can be surprisingly expensive to accommodate at a Walt Disney World resort, because Disney’s hotels aren’t geared toward large families! Ironic for a “family” destination, but true.
These are the occupancies of Disney’s standard hotel rooms:
Value resort rooms sleep 4.
Most Moderate resort rooms also sleep 4; the only exception is the Alligator Bayou section of Port Orleans Riverside, where you can get rooms with a trundle bed that will sleep a 5th (small) person.
Many standard rooms at Disney’s Deluxe resorts sleep 5, except Animal Kingdom Lodge (standard rooms sleep 4 max) and Wilderness Lodge (rooms sleep 4 except for Deluxe Rooms, aka Junior Suites, which sleep 5).
One thing to bear in mind: Disney doesn’t count a child under 3 who sleeps in a crib in its room occupancy limits. You can add one baby to the room without additional charge. So if your family includes a baby, you can subtract one person from your count.
We are occasionally asked if Disney is “strict” about room limits. The answer is yes. Disney didn’t invent the limits; they are dictated by the Fire Marshal, based on the square footage of the room and the number of beds. The limits are for your own safety and comfort. (Also, if you sneak in extra people, they will not receive room keys, so they won’t be able to access Extra Magic Hours or charge anything to your room account. People not listed on your room roster also don’t get to use the FREE Magical Express transportation to/from the airport and they cannot be added to any Dining Plan you purchase.)
http://www.mousesavers.com/walt-dis...-questions-about-walt-disney-world/#bigfamily
http://www.themouseforless.com/tripplanning/resorts/wdwroomoccupancy.shtml