I would do baked beans (we like the vegetarian ones) and either potato salad or coleslaw or pasta salad.
A caprese salad could be yummy too ... fresh mozzarella, grape tomatoes, basil, EVOO, a little drizzle of balsamic, salt n pepper. serves with some sliced baguette.
I recently watched a Pioneer woman show and she made a coleslaw but added sliced bell peppers (red and yellow) and it looked pretty and delicious. I can't find it on her site but did find slaw with her BBQ pulled chicken sandwiches. This one has jalapenos in it, if you are making it for kids I might just leave the spicy out.
◾1/2 head Cabbage, Sliced Thin
◾1/2 head Purple Cabbage, Sliced Thin
◾1 whole Jalapeno, Halved Lengthwise And Thinly Sliced
◾1/2 cup Whole Milk
◾1/2 cup Mayonnaise
◾1 teaspoon White Vinegar
◾1 Tablespoon Sugar
◾1/4 teaspoon Salt
◾1/4 teaspoon Cayenne Pepper
◾2 cups Cilantro Leaves, Barely Chopped
Corn on the cob always goes over well with my kids.
I made a similar corn salad to this one and it was really tasty http://www.bhg.com/recipe/fresh-corn-salad/