Julie,
I realize your post is from 2003. Possibly you found your answer in between. William and Sarah (Bennett) Updegraff are my 5th Great-Grandparents. William was born 1742 and Sarah 1733. Sarah is a widow (John Day) at the time of their marriage in York Co. (1762). They did have a son, William, but born way before 1801. Possibly the William you identify is a grandchild. I do have Updegraff, Bennett, Day & Fincher ancestor documentation for this family and descendant records for my Updegraff 4th Great-Grandmother, if you are still researching.