Hi Christi, an Advance Dining Reservation at Cinderella's Royal Table does require you use an admission ticket into the Magic Kingdom. But don't let this deter you, there are so many other dining options around the Walt Disney World Resort that does not require you to use a ticket.
Instead, think about beginning your magical trip at Whispering Canyon located in Disney's Wilderness Lodge where your family will be entertained by the yee-hawing antics of your servers and ask for KETCHUP! Or if it is a character theme dining experience you are looking for, think about Chef Mickey's located in Disney's Contemporary Resort. There are several dining option located in Downtown Disney that may be of interest to you as well. You truly have many options available to you.
The best way to search for some possibilities is to sign in to your Disney Account and head over to Things To Do, from there choose
Make Reservations under Dining. You then can choose locations that do not include the Theme Parks and put in your date and time and begin searching and looking at the options you have available to you and your family.
If I can be of any further pixie dusted assistance feel free to ask and I hope your trip is filled with many magical and memorable memories.
Amy M*o*