Thank you for all this information. I think Christopher is her father, and marriage records saying her father is Jos. or Joseph are incorrect. But being German, perhaps Christopher did have a middle name (Joseph) at that early date. As for Thomas Murdock being absent from Census records, tradition maintains that he was a surveyor, so his job may have taken him away from home much of the time. And that is why I thought that an "x" (for the male over 45 years old) might indicate a family member away from home when the census was taken in 1820.