Hi, Donise!
Most resorts at Walt Disney World have a limited amount of roll-away beds that can be rented at an additional cost. To make sure your resort can accommodate you, I would call the resort directly to inquire about availability and pricing. To find the phone number to your resort, go to your resort's web page at
www.Disneyworld.com and the phone number is listed on the right side of the page just under the resort's address.
If you think that it might be a bit too "cozy" with all of you in one room, there are some reasonably priced Family Suites at
Disney's All-Star Music Resort. These Value priced suites have a separate bedroom with a queen bed, pull-out sofas in the living area, a small kitchenette, and two full bathrooms. In all, these rooms are about 520 square feet and sleep up to 6 guests.
What a treat to be traveling with 3 generations. Make sure to take plenty of pictures to remember your special vacation to Walt Disney World!
Cathy