Hi, and welcome!
That biting thing was the hardest behavior to get my puppy to stop. It took longer than most any other issue. Must be a Boxer trait.
What I ended up doing is when she'd bite me, I would have to say very sternly "NO!" and get up and walk away from my puppy and ignore her until she calmed down. Sometimes she'd start up again immediately, and I would have to get up and do it all again. It took several weeks for her to "get it," but now she's wonderful and even though we play and I let her tug on my sleeves at times, she does not bite me.
The time out suggestion will probably work too. They have to understand that it is not acceptable behavior. Unfortunately, it is such an ingrained trait and they would be learning how to "soft bite" with their mother and litter mates were they still with them, you have to teach them. It just seems to take more time and patience than teaching other things. Look up soft biting on some training/behavior sites on the internet and you'll find several suggestions.
Consistency among family members is important too. If you decide on a method, everyone must follow that method, no exceptions; or it becomes too confusing for the puppy.
As in all training, consistency and persistence and lots of love and praise for correct behavior are the keys to success.
Good luck and keep us posted.
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Dan from Brooklyn
Proud Pappa to Maggie Mae
Born 6/16/00
Flashy Fawn, docked tail, natural ears.
Pictures:
http://www.d-batt.com/Maggie.html