I've just posted to RootsWeb's WorldConnect site a database of 497 individuals and 157 marriages of folks descended from this couple. The information was, for the most part, taken from an unpublished manuscript written by Gov. Samuel W. Pennypacker of Pennsylvania ca 1880. From the manuscript it would appear that Gov. Pennypacker corresponded with relatives across the country in the 1870's and compiled the family records. He did not give sources and I've not tried to document any of the information, as this is not my direct line. Some, but not all, parts of this data may be included in SWP's published books. I wanted to share this information since much of it probably came from family Bibles and close relatives and may include information not available in public or published records. The title page states that it is a record of the Pannebeckers from 1674-1880, so obviously there will be a lot of omitted names and dates that occurred after that date.
If you are interested in this information, you can access it directly at WorldConnect by searching for "avand1571" in the database field.