Currently, the AKV is the only DVC resort that officially has sleeping spaces for five in a one bedroom - one king bed, one queen sleeper sofa and one twin sleeper chair. The other one bedroom villas don't have the twin sleeper chair, but DVC is currently allowing a fifth person (child) in the one bedroom, but they don't provide any additional bedding, towels, etc. You have to bring your own.
When Kidani Village opens at AKV, they could go back to not allowing the fifth person in the one bedroom.
Someone will undoubtedly bring up the Studio Plus at BWV (one queen bed, one double sleeper sofa and one "daybed"). However, you cannot reserve one, it's only a request and the so called daybed is more like a deacon's bench with a thin pad on it - crib sized at most.