All the Cox brothers that are related to me came from Limestone,County Alabama. Their mother and some of the family moved to Hempstead County in the 1850's from Alabama. I know Fulker Cox and his wife Sarah and daughter moved to AR after 1860 because they are in the Census in Limestone County AL in 1860. I would say that James being a younger brother would have been in Hempstead county AR with his mother.