It goes back to many discussions we've all had here: Training & Supervision. Know your dogs… and teach your kids those limits and respect. Our two girls are toddlers (4 year & 18 months, respectively) and they both learned very quickly the "rules" about the dogs.
The problem is when their friends / relatives come over or their siblings. Example, a friend of my daughter's mom came to picker up unexpectedly. They were at a Church function with me. My wife did not put the basenji's in their crates, not knowing who was there. The mom had a little girl that was about 6-7 at the time. My wife greats them at the door, the little girl just runs into our house and corners the dogs trying to pet them. Our dog's react and of coarse our Tri bit her hand!
No time to react it all happened so fast.
No blood, but still A dog bite. Luckily the mom was very understanding. I told her that the dogs had their shots and we would pay any medical bills. She apologized for her daughter's behavior. We were really lucky. she pressed no charges or any bills. Unfortunately that ended my daughters friendship.
That's the point of this is you can't count on the other kids to be behaved and if any ones rough or inexperienced, you and your dog can pay the price.
I know a guy who had a Rotwieler that was on a leash when a neighbors little unleashed shelty ran over and harassed his Rot. The Rot grabbed the shelty and would not let go. The Rot injured the dog and my friend was forced to put the dog down and pay for all the medical bills of the shelty. It did not matter who started what.