They were married in 1823.[7][8] Twain was of Cornish, English, and Scots-Irish descent.[9][10][11][12] Only three of his siblings survived childhood: Orion (1825–1897), Henry (1838–1858), and Pamela (1827–1904). His brother Pleasant Hannibal (1828) died at three weeks of age,[13][14] his sister Margaret (1830–1839) when Twain was three, and his brother Benjamin (1832–1842) three years later.