[alaskayorkie]

Wow, that's scary. Sounds like an issue for a behaviorist. Socialization begins when they're still with the litter and is especially important the first few months you have them. They should be exposed to and handled by lots of people. If you did anything wrong, that would be my guess.

I'm not qualified to give you advice on what to do now, but biting humans can't be tolerated. I'd try to find some professional help. In the meantime, make sure the kids aren't surprising him when he's sleeping, and make sure he's getting lots of exercise. Make sure the kids know what sets him off, and teach them how to be cautious around him.