Thomas and Joan Smith of Chard, England were the parents of the 1st Landgrave, Thomas Smith(who died 11-16-1694 in his 46th year). 1st Landgrave Thomas Smith first married Barbara Atkins (d. 1687). Thomas and Barbara were the parents of the 2nd Landgrave Thomas Smith and his brother George Smith. After Barbara died, The 1st Langrave married Sabrina de Vignon. The 2nd Landgrave, Thomas, Jr. married Ann Cornelia Van Myddagh, and secondly, Mary Hyrne in 1713. Thomas, Jr. and Ann had: Thomas, George, Ann, Sabina, Justina, Sarah and Rebecca. The 1st and 2nd landgraves came to America together in 1684. The genealogy of this family is rather extensive and intertwines with many great colonial families of Charleston. A copy of the genealogy can be found in early issues of the SC Historical and Genealogical Magazine, and the SC Historical Society reprinted all their previous genealogies in a five volume set in the 1980s. I hope this helps.