Hello, Erica!
Welcome to the Disney Parks Moms Panel! We are delighted to answer your question regarding your upcoming Walt Disney World vacation! I am SO excited for you to see and experience Walt Disney World with your nieces and nephew! I KNOW you all are going to have a MAGICAL time!
In order to accommodate your additional family members for a restaurant reservation, you will be required to cancel your initial reservation and then book a new reservation for the whole party. If you show up to the restaurant with additional family members, a Cast Member will not be able to seat your family. My recommendation would be to call (407) WDW-DINE and speak to a very helpful Cast Member. Explain your situation to the Cast Member and then ask to check for availability. If there are no reservations at
Cinderella's Royal Table, I would call every other day until a Cast Member finds a cancellation. I have called MANY times for a reservation I really want, and I can honestly tell you that persistence WILL pay off! All you need is a little faith, trust, and pixie dust!
If you have other questions, please let us know! We are here to help in any way!
Have a MAGICAL day!
Wes