this puppy behaves this way because it's a pup and because it hasn't been trained.
dogs are pack animals. it has to bond with it's pack, which is you and your family.
if it sees you are the Alpha Male of the pack, then use that to train it.
face it, you have to take Some time out of the day to do this training or you will live with an out of control dog.
take a firm tone - not yelling.
when the dog knows who's boss, it will listen. you just have to take that time. and the chewing is all part of that puppy behavior. he has to be trained out of that as well.
sometimes having a spray-bottle of water or (diluted) lemon juice around and spraying him whenever he tries to chew (and saying a FIRM "NO") will get him to associate your voice command with the spraying.
time and effort are the only answer.
trust me, we've had several dogs over the years. all well behaved.
