Hi there, Kathy!
Dining at the Walt Disney World Resort is so often more than just a meal, but an experience. And it's always better when an experience is shared with friends and family.
Your relatives are welcome to dine at any restaurant on property. Do make sure, however, that you include them in your count when you
make reservations online or by calling (407) WDW-DINE. Let your reservationist know that you will have the
Disney Dining Plan.
When you arrive, inform the Cast Member who seats you that some of your party is on the plan, and some are not. This will allow him/her to split the checks accordingly.
Beyond that, you'll just have to make sure to relax and enjoy!
See you later, celebrator,
-Deborah B.