Hi Sandy,
It sure sounds like you have a fun trip planned!
My family LOVE character meals and have eaten at almost all of them. This is a great way to have photographs taken with the characters and to collect autographs without having to spend time waiting in line at the parks. Bearing in mind the ages of the children in your party, I would recommend the following:-
1/ Chef Mickey's at Disney's Contemporary Resort
2/ Donald's Safari Breakfast at Tusker House in Disney's Animal Kingdom
3/ Playhouse Disney's Play 'n Dine at Hollywood & Vine at Disney's Hollywood Studios
If any of the children are fans of the Disney Princesses then you could also consider either Akershus Royal Banquet Hall in the Norway Pavilion at Epcot or Cinderella's Royal Table in Cinderella's Castle at Magic Kingdom.
You can find out more information about the different character meals available
HERE
Wishing you all a magical trip!