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So neither people were actually in your yard? They were both standing outside the fence? You're right, something must have happened to cause this aggression. Sonny had to run up to the fence and jump to bite them. It would be different if it was a stranger approaching your children, or walking in the yard...
I would be very worried. If the dog isn't gotten in hand someone else could be bitten, report it, and eventually cause the dog to be put down. I'm sure he's a very good dog, and something bad happened to him. I honestly don't know how to correct it, but I know that the authorities are firm on this matter. Maybe some dog behavior books from the library, or google searching, or even a trainer if you have the money.
Hope it turns out okay!