Thank you for answering and figuring up what you did. Just to show what we figured up and please tell me if I have done the calculations wrong (I'm not the best at math). We are staying for 7 nights and have 2A and 2C. We figure that is 42 adult credits and 42 child credits. They have 3A and 1C. So 42/5 adults=8 meals per adult and 2 meals left over for my husband and I to go on an anniversary lunch. (they are watching the children for us). 8 meals x 3Children=24. 42-24 credits=18 child credits left over. These are the ones I am wondering if we can use at quick service places like Be our Guest for children and adults. We will plan to eat breakfast in our room (cereal or something) and just use the credits for lunch and dinner on the 7 days in the parks. We will not eat there on arrival or departure days so it will leave 2 meals not paid for if we can use the child credits for two quick service meals. If not we will just pay for the adults to eat at 4 meals.
So their child is the 12 year old, thus an adult on the meal plan? That makes a big difference.
The Deluxe dining plan is 3 table/quick service credits per person per night.
7 night stay (I'm going to ignore snacks in my calculation):
Adults - total of 42 table/quick service credits (3 credits/night/adult x 7 nights is 21 credits per adult times 2 adults equals 42)
Child - total of 42 table/quick service credits (3 credits/night/child x 7 nights times 2 children)
You will have only 42 total credits to share between 5 adults...that's 8 table/quick service meals, plus the 2 left over credits you want to use for an anniversary lunch.
The three kids can have a total of 14 meals. Any unused child credits can't be used by adults for a meal off the adult menu. While some have said you might be able to get by using kids credits for adults, I wouldn't count on that, especially at Be Our Guest.
You will need to call Disney dining and specifically ask if adults can use leftover child dining credits at a quick service restaurant, especially BoG. Even if you plan on ordering off the kid's menu, they may not let you, since that's technically against the dining plan's policy.
Good luck