Good luck tracing James Rushing Harris' roots! https://familysearch.org/
has marriage for Louisa A. R. Tidwell to James A. "Summers" on 29 Nov 1883 in Panola, MS. Unable to find a James with surname Harris or Summers in 1880 Panola, MS. His inlaws are relatively easy. Alexander J. Tidwell wed Sarah A. Mooney 23 Nov 1855 in Marshall, MS. Perhaps a copy of Louisa Tidwell's marriage certificate will enhance your search?