Hello Christine,
When making Advance Dining Reservations for a Table Service restaurant at Walt Disney World, include everyone in your party. This allows for your table to accommodate all of your party to dine comfortably and with plenty of room.
Before your 180 day mark arrives, I recommend having a list of table service restaurants you are interested in and be prepared for a back up table service restaurant just in case, your first choice is not available. You can make advance dining reservations
online, but I personally recommend calling (407)WDW-DINE for a party of this size. Cast Members are readily available to see what Disney Dining Magic they can make happen. If at the time you make your Advance Dining Reservations and are set on specific table service restaurants that is unavailable, keep checking back. With a little bit of Faith,Trust and Pixie Dust an opening could come available.
Also, consider some of the Quick Service restaurants. Walt Disney World offers a variety of food selections resort wide and can easily accomodate a party of your size at any given moment you get a rumbly in your tumbly.
If I can be of any further pixie dusted assistance feel free to ask and may your upcoming stay at Walt Disney World be filled with many memorable and magical moments.
Amy M*o*