Robert Todd Lincoln, the only child of Abraham Lincoln to live to adulthood. This was taken in 1922 at the dedication of the Lincoln Memorial in Washington DC. Robert was at Abraham Lincoln's bedside at his death. Robert Lincoln was also at the Sixth Street Train Station in Washington, D.C. on July 2, 1881, and witnessed the assassination of President James Garfield. At the time Lincoln was serving as Garfield's Secretary of War.