Most DVC 2 bedroom villas and larger will accommodate 8 adults plus two young children. These rooms will come with 1 king bed in its own room, 2 queen beds in the second bedroom, and a pull out couch and a fold-down single bed or chair that converts to a bed in the living room. You're essentially sharing a 2 bedroom apartment with a full kitchen and washer and dryer in the room. It will be a little cramped for 8 adults, but if they can all share beds it won't be a problem.
If you have the money, a 3 bedroom will include 1 king bed, 4 total queen beds, the pull out couch, and the single bed. It's more money, but if you have 4 families splitting it that could work. For either of these options, compare the price of booking with Disney vs renting DVC points.