Any of the deluxe resorts will hold five. POR will hold five in a trundle bed room - two double beds and a trundel. Deluxes have two queens and day bed. Some of the deluxes only hold 4, but each deluxe resort should have rooms that hold 5.
The FW Cabins hold 6.
DVC two bedroom villas hold up to 8, plus one under the age of three.
The Doubletree Guest Suites on Hotel Plaza Blvd (not on the Disney property, but near DTD), can sleep 6.