Hi John,
How wonderful that you will be sharing the excitement of a visit to the Walt Disney World Resort with extended family.
The best way to ensure that both families are seated together would be for one person to make the Advance Dining Reservations for the entire travel party.
So, for example, lets say that there are 4 people in your family and an additional 5 people in the second family. All you would need to do is make one dining reservation for a total of 9 Guests. Do not worry about the fact that you will require two separate bills, just let your server know once you are seated and it will be arranged for you.
Advance Dining Reservations can be made up to 180 days in advance
online or by calling (407) WDW-DINE.
Wishing you a magical trip filled with memories which will last a lifetime!
Emma