Please get qualified help and support. A friend of mine had a similar dog and it bit their child - unfortunately the dog is no more. Don't let it get to that, get qualified help and support. Until then, if your dog is aggressive then separate him - put him in another room. Dogs need to be shown that they are not the leaders- you are. If he growls, out of the room away from everyone else, or if outside - turn your back on him.

Best of luck - you never know, the right training could help him become a family dog.