The only moderate that will sleep 5 is Port Orleans Riverside, and only in the Bayou section. You need to request a trundle bed room.
Of the deluxes, all of them will sleep 5, but not all in the standard rooms. I think only WL and AKL will not sleep 5 in a standard room, provided you get a room with a daybed, although I'm not postive on that. I do know that the MK monorail resorts will sleep 5, not sure about Epcot area.
Another option is Fort Wilderness Cabins, those will sleep 6. Or, a 2 bedroom (best bet is to rent points) at a Home Away from Home (such as Boardwalk Villas, Villa's Wilderness Lodge, Beach Club Villas or OKW), which will sleep 8.
Enjoy your trip.