If you can get back into the BoG FP+ website to review your order, there should be a way to modify it . I can't get that far into the website myself right now, but, if I recall correctly, when you select a meal, there's a little icon that looks like a pencil in the corner somewhere. It isn't really obvious and you have to look for it. If you click on that, it should give you an option to alter the meal by leaving condiments or toppings off sandwiches, and such. I think you'll still have the opportunity to change your order after you check in - just tell a CM that you need to do this. Or you could just cancel your pre-order and order your food when you arrive. It really only takes a few minutes, and that way you could be sure you can get your son just what he wants.