The dog was being a dog. I blame the owners for having the dog out amidst a loud party, I blame the breeder for breeding dogs with downright crappy temperaments, and I blame the victim for being a moron of epic proportions.
Last month I came home late, my parents were out of town and I had Dakota loose in the house. As soon as I got inside, he came running down the hallway making a horrendous roaring noise and backed me into a corner. If I'd have taken a step forward he would have bitten me.
Several things were weird to him: I'd been riding with people who were smoking and must not've smelled like me, I had a big flamboyant hat on (won it and wore it as a joke), and I didn't announce my arrival. But as soon as I said "hi, Dakota" he immediately dropped to the floor, rolled over on his back and groveled. He did what he was supposed to do, he just didn't know it was me. Mind you, he's not a vicious dog or poorly raised/trained. He's a therapy dog! It's just dog behavior (not border collie behavior, not pit bull behavior or rottweiler behavior) to react to a stranger on their territory, and some dogs react with greater severity than others.
That dog didn't do anything wrong, and his aggression was probably exacerbated by the fact that the children were scared and screaming. If the dog didn't live with the uncle, how on earth would you expect it to recognize him amidst the chaos?
I don't know what I would've done with that dog. For a 10 month old puppy to seriously maul someone would be pretty bad, considering the dog's not even close to being mentally mature and its instincts haven't kicked in all the way.