Studios are limited to four persons plus one child under the age of three. And studios never connect to other studios. They only connect to one bedroom villas to make a two bedroom lockoff.
With your family you would need a two bedroom villa at at minimum. Unless you are looking at an adult getaway.
Only a 2-bedroom lock-off will be made up of a 1-bedroom and a studio with an interior connecting door. A dedicated 2-bedroom will have a normal 2nd bedroom.
To add to what Michael said, in the 2nd bedroom of the dedicated 2BR you get a closet instead of the kitchenette. There is also no door to the hallway in the 2nd bedroom. There are usually two queen beds in the 2nd bedroom of a dedicated 2BR except in some of the dedicated 2BRs at BCV which have a sofa bed instead of a 2nd queen bed.
And if you have a dedicated two bedroom at OKW, you won't have a balcony off the second bedroom. But you will have a second bathroom sink just outside the bathroom.