Mark Twain three of his siblings survived childhood: Orion (1825–1897), Henry (1838–1858), and Pamela (1827–1904). His sister Margaret (1830–1839) died when Twain was three, and his brother Benjamin (1832–1842) died three years later. His brother Pleasant Hannibal (1828) died at three weeks of age. When he was four, Twain's family moved to Hannibal, Missouri, a port town on the Mississippi River that inspired the fictional town of St. Petersburg in "The Adventures of Tom Sawyer" and the "Adventures of Huckleberry Finn". Slavery was legal in Missouri at the time, and it became a theme in these writings. His father was an attorney
Mark Twain Riverboat Mark Twain Riverboat "Mark Twain" Riverboat is an attraction, located at the Disneyland theme park in Anaheim, California, on which passengers embark on a scenic, 12-minute journey around the Rivers of America. Originally named "Mark Twain" Steamboat when the park opened in 1955, the stately, 5/8-scale stern-wheeler was the first functional riverboat to be built in the United States for fifty years. Other Disney riverboat attractions now appear at Walt Disney World, Tokyo Disneyland and Disneyland Paris. Passengers wait for the 150-ton, , riverboat, which departs every 25 minutes, inside a sheltered area in the Frontierland section of the park.