OK, I watch the Dog Whisperer every week, and something like this was on last week. What he did was to bring 2 kids (his kids) around the dog, but they had to be very calm and not even look at the dog. No eye-contact. Then he sat them (the kids) on the floor, and they were still and quiet, and he let the dog check them out. Eventually, when the dog realized that they were OK, then they could give him treats, and after awhile, slowly pet him and such. By the end of the show, the dog was cool with these kids, but they had to still take it easy with others. I don't know if this helps, or if it is possible for you to even try, I just thought I'd pass it on. Talk to your new puppy trainers for sure. Good luck. And I'd teach that kid a lesson yourself if the parent's wont do it!!!