your son is timid of the dog . So he is already stressed , and then the dog gives him good reason to be frightened .
You bought an adult dog , without training , recently, and have not trained him , given him full freedom , while the son, the family are inhibited by the dog. Your son should be able to move around his house , wake up in the middle of the night to go to the bathroom without thinking about hazards .
You either crate the dog whenever he is not being trained, under supervision/control , until you know the dog and he knows his place -- or he goes back. I would opt for the GO BACK , no chances with dogs and kids .
Sounds like a distress sale in the first place . Why did the person sell the dog ?
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