One thing that stops my dogs in their tracks (whatever it is they're doing wrong) is to make that UH UH noise. Real guttural and serious. It's hard to describe

I also refuse to play anymore if the biting doesn't stop. Is there anyone in the family that allows the biting to themselves? If so, it'll NEVER stop, ugh! My husband thinks it's cute when Luna bites his hands, of course his are tough and calloused. I have to remind him all the time that she doesn't know the difference between his hands and everyone elses so it has to be no biting at all
I hope that it stops and you get some more good tips here