A 2BR villa will be easiest to get. Location would depend on preferences (Epcot/Boardwalk restaurants vs Monorail loop restaurants). In my experience, older kids will indeed share a bed if it means staying in a more luxurious resort.
I travel with extended family, including numerous adult nieces/nephews, often, and adults are very willing to share a bed at BC rather than having their own bed at a value, for example
Other than that, their options (if they want restaurants nearby, great pool and pool bar, etc. at their resort) is to rent a studio in addition to a 2BR or rent a larger suite at a deluxe (a *really* pricey option, and keep in mind that while many deluxe suites are large in size, not all sleep over 3 or 4).
I travel with extended family, including numerous adult nieces/nephews, often, and adults are very willing to share a bed at BC rather than having their own bed at a value, for example
Other than that, their options (if they want restaurants nearby, great pool and pool bar, etc. at their resort) is to rent a studio in addition to a 2BR or rent a larger suite at a deluxe (a *really* pricey option, and keep in mind that while many deluxe suites are large in size, not all sleep over 3 or 4).

