Sorry man, that's unacceptable. I know it's your baby boy and you probably love him, but that level of agression can't be tolerated. Not over such a long period where clearly he doesn't respect you and there's been no progress. This behavior is too ingrained now.

If anyone had seen your dog attack you like you claim, where you can't control him, then they would have every right to phone the police and try to get your pet put down as a danger. Honestly that seems like what it deserves. You lose the leash one day and all it takes is for a kid to be standing in the way of where he wants to go.

Put it down. Get a more loving and caring dog that won't attack people, especially an owner that feeds them. That's where you cross the line. Once is a warning, any more and it's a habit and a pest. Alternatively, get it nuetered right now and see how his behavior changes.

If you don't like either of those options, you need to look at rehoming it. See if there's any nearby countryside homes or farms looking for a pet. Take it to a shelter or something, make it clear she's agressive and a biter during walks.