Unfortuneatly, values cannot accomodate 5 unless the 5th person is a child under 3 in a pak-n-play crib - and that would be very tight.
You're options for 5 are POR in the AB section - they offer a trundle bed for the 5th person for a little extra per night - I think $15 or so??
You could also do 2 rooms at a value and they will guarantee them to be connecting since you have small children - you get 2 bathrooms and 4 beds this way.
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you can do the Jr.suite at CSR in the moderates they accommodate 6 I believe.
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FW cabins will accomodate 6 with a bdrm that has a queen bed and a set of bunk beds, and a murphy bed in the living room. These also have a full kitchen which could help you save on meals if you're willing to do some cooking. If you get a discount code I've seen the cabins for as little as $144 per night for value season.
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WL has a Jr.suite which will accomodate 6 - you'd be going up a notch to the deluxe resort but it the least expensive of the deluxes and you may be able to get a decent rate with a discount code.
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Any the deluxes will accomodate 5 with 2 queen beds and a daybed. Although, this option could cost more than getting 2 connecting rooms at a value and you'd only get 1 bathroom.
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You can do a 2bdrm villa at any of the DVC resorts - the least expensive way to do this would be to rent points from a member but either way, you're getting into the "pricey" catagory to do so.
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a suite at any of the deluxes will of course be able to accomodate you but then "pricey" takes on a whole life of it's own IMO
Anyway, these are your options -- personnally, I think I'd either get the 2 rooms at a value or the AB section at POR with a trundle depending on which turns out to be less expensive if budget is a factor in your decision. If on the other hand $$ isn't as much a factor, I'd rent the points for a stay in a DVC villa.
HTH's