Hi Carrie!
Your best option to ensure comfort and privacy in your sleeping arrangements, while still staying within the value or moderate resort level for pricing, would be to consider a Family Suite.
Family Suites are available at
Disney's All-Star Music Resort as well as the newest, and most efficiently laid out suites at the brand new
Disney's Art of Animation Resort.
You'll likely find that Art of Animation best suits your needs for separate beds for both of your growing children as well as providing you with a separate bedroom and ensuite for the grown ups.
Alternatively, if the addition of a kitchenette isn't of particular need for your family, reserving connecting, adjoining standard rooms at any of
Disney's Value Resort Properties would be your most economical way of securing separate sleeping arrangements for the tween and teen and some privacy for you!
Check out the options available via the links I've provided to you above. You'll find a full description of room types and seasonal pricing under the Room Types & Pricing link on the left side of each property's page.
I welcome you to visit again any time if you have further questions or would like additional recommendations.
Wishing you a Magical time as you begin planning your family's next Walt Disney World vacation Carrie!
Kirsten