Both the father and mother are AKC registered. The stud got his daughter pregnant. I don't know how close the blood line can be and the puppies be certified. Is there anywhere I can get a printed list of regulations for bloodline relationships?

Since the registry isn't worth the paper they send you.. It's irrelevant really..

I'd have aborted the litter if it was an oops though. Unless you know your lines very very very well, doubling up on genes breeding that closely can be good, or can be a disaster.