Just got back last night. We shared all of our meals and our kids are much older than yours (9 and 13). It was never an issue to share at CS or TS restaurants. As the dining plan states, use your credits any way you want to. That's what we did and we were never overstuffed and left every table very satisfied after sharing meals.
Remember, you get dessert too at CS restaurants and appetizer and dessert at TS restaurants (and at many TS, you can get smoothies or shakes for drinks too). Go and enjoy and order the amount of food you and your family can eat.
We actually left with 3 un-used CS credits yesterday and were going to go to Earl of Sandwich and get dinner for on the plane, but we ran out of time.