 Liscum married May Diven, the daughter of Alexander S. Diven, a former United States Representative from New York's 27th congressional district, on September 4, 1867.Liscum was a member of the Military Order of the Loyal Legion of the United States and the Grand Army of the Republic.His last words, "Keep up the fire, men," or "Keep up the fire," have become the motto of the 9th Infantry Regiment.