About Quentin Roosevelt
Quentin Roosevelt I (November 19, 1897 – July 14, 1918) was the youngest son of President Theodore Roosevelt and Edith Roosevelt. Inspired by his father and siblings, he joined the United States Army Air Service where he became a pursuit pilot during World War I and shot down one German aircraft. He was killed in aerial combat over France on Bastille Day (July 14), 1918. He is the only child of a U.S. president to have died in combat. Quentin's behavior prompted his mother, Edith, to label him a "fine bad little boy".
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.