I checked the 1850 Greenup Co. census and found Henry Davis age 33 b. KY married to Elizabeth age 30 b. VA. They were married 10/24/1838. There are no children listed for them. There is a Matilda Jones age 1 and William Gee age 29 living in there household. There are quite a few Davis listed on this census but the only other Henry I found was age 14 (about the right age for your Henry O.) in the family of James Davis age 58 Levina age 57, Sarah age 19, Margaret, 16; Henry, 14; William, 11; James, 8; & Mary, 5. Could it be that you have the wrong father for Henry O? There are quite a few more Davis on this census if you would like a lookup.