In doing my research, the 1850 census that you listed is the Henry Clay in my family. I found a church record for his marriage to Rosella Moore and it lists his parents as William and Henrietta. It looks like the Henry Clay tombstone may not be the correct Henry for my family. Going back beyond Henry is where I'm completely stuck. Our family is so small that there is no one left to ask. I'll try to find a baptism in church records. Thank you for your help, it's greatly appreciated!!