If you are a family of 5, as long as one is under the age of three, you can fit in a studio or a one bedroom. If one is three or older, you won't fit in a studio. Member Services (but not CRO) is currently allowing five in a one bedroom, but they will not provide any additional bedding or linens. You'll have one king bed and one queen sleeper sofa. In a one bedroom (and also a studio), you'll get four bath towels, two hand towels and four face cloths.
Allowing 5 in a one bedroom could change as soon as AKV opens since they will have some one bedroom villas that will sleep five (one king, one queen sleeper sofa and one single sleeper chair).