My springer lab is/was the same way. But only he bit my future step brother in law and hes 8 years old. It was scary for me because he has never done anything like that before and I cried for days after.

We went to a dog trainer, I know some of us do not have the money for that, and I was indeed one of them and still am. But we just called her up told her his history, what happened, and what kind of food he eats just everything. 

She told us starting with the oldest person feed the dog a little piece of gas station meat nums ( those sticks of meat I have no idea what they are called), and work your way down to the youngest. This proves to the dog that the kid is ok and if the dog is nice to the kid it gets a num num. 

When you have your kids near your dog, and he starts acting funky like not wanting to play or looking at her, call the dog yourself, tell the dog to come to you, and give it another num num. This shows the dog to leave what is bugging s/he and to go to you. If the dog does not respond then you have to train him to do so. 

Also look at your dog food. If there is any CORN at all, get rid of it. CORN IS BAD. There was a study done a few months ago she said, that they did on aggression and dogs. All the food that they feed the pets had more aggression then those with out corn. 

It might be easier for you to find a food without corn, when we switched our food from Beneful it took us a month to find a food that both of our dogs could eat, because they both are allergic to chicken. turkey, anything with feathers. It also needed to be a diet food for a senior dog and an adult dog. We finally found out food at petco, its 50 dollars but tell ya what, 50 dollars is alot cheaper then doctor bills, or even worse court fees. 

 I am so sorry that this is so long. I'm just telling you what she told me and personal information.