Steph,
I think you have a good concept, but agree with Denise that you may want to come up with an angle that is different.
Either make the grilled cheese have a different flavor, or make it fun somehow. (Think international like "Croque Monsoeur(I don't think I spelled that right. My French is trés rusty.) or Croque Madame" or fun plating like dinosaur or animal shaped sandwiches, or Grilled beyond cheese and add grilled PB&J, grilled ham and cheese...)
Also, think of simple things, but don't be afraid to introduce kids to new flavors. Like suggest "Think beyond American singles for your sandwich, try cheddar, Swiss, Gouda or Havarti"
And new foods, many kids need to learn to eat a wider variety of food.
Also, I do think you need to target an age group. The older the child, the less parental involvement that will be needed in the kitchen, and they may already know how to make a grilled cheese, mac and cheese and chicken fingers.
If you focus on very little kids you may want to come up with more cold foods, that need to be "assembled" more than cooked, and that may not need knives to prepare.
The other thing I recommend is that you think of a few recipes you are considering and invite some kids over and test drive them. See how much supervision they need. See if they can follow your directions, and see how it turns out with little involvement from and adult.
Dawn
"Success is not the result of spontaneous combustion. You have to set yourself on fire." anonymous