You're going to be hard pressed to find something that fits your needs on property that isn't either adjoining rooms or a very expensive DVC villa.
There are options, though. All Star Music has family suites that may fit your party, and the new Art of Animation resort might be open by your booking dates, and the suites are supposed to open first.
You should call WDW and inquire about Art of Animation, actually. It's a value resort and it has a lot of suites. If it's open in time for you, it will be the best fit on property for your family. It will be a tough ticket, though, so call them soon, if you're interested!
Oh, and as for the villas, there are two-bedroom models that can comfortably sleep seven all over the property, but like I said, they are quite pricey. Your best bet on those is probably to rent DVC points from an online site like DVCRequest.com. It will save you some money.
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