Jessica,
one of the things Julie was alluding to in her post was how physically firm you can be in correcting a puppy. With certain breeds -- Goldens, Whippets, etc. -- you can be pretty stern in terms of corrections including alpha rolls if you are so inclined. With more "dominant" breeds, lots of people will tell you that stern corrections only exacerbate the behavior. Poppycock!

We've always corrected our puppies -- whether Goldens or Rotties -- the same way their moms do in the whelping box: we take them by the scruff of the neck and shake them until they squeal. Then, we walk away and don't pay any attention to them until they demonstrate proper behavior. And our puppies have grown up to be Therapy Dogs, Champions and multi-titled working dogs.

Since you got this dog after the initial "breaking in" period of 8 weeks, you might have to correct certain behavior in a way that he understands that you actually mean it. You have to be gentle but firm. The puppy needs to understand that certain behaviors are not acceptable. Once you establish the ground rules, you can then work on training the behaviors that you DO want especially with the younger family members.

Hope that helps some,

Jim