An Ancestral File has Mary Ann Jackson, wife of David Jackson Barnett. Her parents are shown there to be Robert Jackson and Elizabeth Coberly. More details at: https://familysearch.org/pal:/MM9.2.1/3SS6-X4V
It would be best to verify the accuracy of this file-> The information has not been verified against any official records. Since the information in Ancestral File is contributed, it is the responsibility of those who use the file to verify its accuracy.