[JoeyP]

Puppies will try to find where they fit in the family hierarchy

Your puppy is trying to exert his place ... unfortunately he is doing it at your expense
This is very important
If you don't want an aggressive dog
Then you have to nip this in the bud right now
He cannot react like this to you or anyone in your family
If he does he has to be corrected and you do this by lightly but with force grab him by the neck
Now if he backs down it ends there but if he still goes to bite or growls he needs to be immobilized and you do this by pinning him to the ground
The important thing to remember he cannot go to bite EVER

Some tricks you can employ that will help
When you go to feed him make believe you are eating it first
This sets you up as the leader
While he eats move his bowl from place to place ... this stops any food guarding
Samething with toys and bones ... he should allow you to take toys and bones from him at anytime