His son William Hamilton Harris (1838-1895) was a brevet lieutenant colonel in the Army Ordnance Department. His daughter Clara Harris and his stepson/future son-in-law Henry Rathbone were the Lincolns' guests at Ford's Theatre on April 14, 1865, when the president was shot and killed by John Wilkes Booth. Booth stabbed Rathbone in the arm when he tried to stop the assassin from escaping. Clara and Henry were married in 1867, but were also step siblings Harris had remarried to Pauline Rathbone, Henry's mother.