Jackson and Calvert families

Thomas Garner JACKSON & Elizabeth CALVERT
Looking for parents and siblings of Thomas Garner JACKSON (27 Aug 1805-8 May 1855) and Elizabeth CALVERT (27 Jun 1809-8 May 1886), both reportedly born TN.Dates from tombstones in Florence, Williamson Co., TX.Married 17 Jan 1829 Maury Co., TN.In Marshall Co., TN, by 1840; Giles Co, TN, 1850.Came to TX about 1850.Parents of 12, including James, David, William, Isaac (my g-g-grandfather, who married Emeline Dufur), Andrew, Stephen, Lewis, Eliza, Christopher, Alice, Mary, & one other, name unknown.Williamson Co. History book lists Thomas’s father as Brice JACKSON; however, the article contains too many errors to be considered a reliable source.Does anyone have proof that Brice is or is not Thomas’s father?Does anyone have information about Elizabeth’s family?