From what I've found on the internet and this website, Albert H. Knapp married Laura Anna Bean and they had Francis Atherton and Donald Knapp. Francis married Alice Royal McCarthy and had David Atherton Knapp. David has 2 children, Barbara and James Atherton, who is my father. Please reply if you still use this and I can give you some more information. I have just started using this and know next to nothing about the Knapp side of my family.