Thanks to Don Collins [Mabry family researcher], I can now also add this information from the 1860 Pickens County census:

Benerson (?Davidson) Mabry age 30 b SC
Sephin? 31 AL
Mary Davidson 15 AL
Joseph James 35 SC

"The near neighbors of this household were: Atkinson, Lofton, Jones. I believe the head of household came from Union Co., SC and that he may have been a son of Jesse Hughes Mabry who was also from Union Co. and moved to Pickens." Don Collins

There is a researcher that has been investigating the Davidson connection to this family. If I recall correctly, her postings and questions are on one or more of the Pickens County discussion boards.

[Note that, as usual, the 1860 census appears to have incorrect ages for Joseph James Mabry. That situation has been discussed on the Arkansas in the Civil War board.]