Children of Highsmith Harris

Currently working the family of Thomas Highsmith Harris and Martha Elizabeth Skiles of Warren County, Kentucky. Thomas and family moved to Lancaster TX in 1852.

I'm looking for any leads on 3 of their 8 children: A. H., Mary Thomas, and Charles T - all of KY.

The family is together in the 1850 KY Census. In the 1860 KY Census, I lose track of the 3 children. Does anyone have any information on these 3 children? Thanks