I finally found John Whittenburg today in the 1850 Marshall County, AL census. John's daughter Rachel had 3 children all with the last name Whittenburg. Silas McFerson born abt 1850 (he's 2 months old in the 1850 census), Francis C. (female) was born in 1853 and Louis, I don't have any more information on anyone but Francis.
Francis married John Lewis and had Alice Francis Lewis.Alice married James William Floyd. I'm related to the Floyds.