Quentin Roosevelt was born on 19 November 1897. He was the youngest son of 26th U.S. President Theodore Roosevelt.
A Lieutenant in the U.S. Army Air Corps during World War I, he was killed when his Nieuport 28 aircraft was shot down behind German lines on 14 July 1918. German soldiers placed a crude cross over his grave, near the rural French village of Chamery, near Reims.
The grave subsequently underwent some revisions and was treated as a pilgrimage site by admiring U.S. and French citizens. On 12 July 1944, Quentin's oldest brother, Brigadier General Theodore Roosevelt, Jr., died of a heart attack in Normandy following the invasion of France. After the war, the two brothers were buried side-by-side at the U.S. Military Cemetery, Colville-ser-Mer, Omaha Beach, Normandy, France.
The original cross placed on Quentin's grave is now on display at the U.S. Air Force Museum at Wright-Patterson Air Force Base in Ohio. Quentin's mother, Edith Kermit Roosevelt, later had a stone monument fashioned to cover her son's grave. When Quentin was re-interred at Normandy, the stone from his grave at Chamery was moved to a location of honor on the lawn of the Roosevelt home, Sagamore Hill, Oyster Bay, Long Island, NY.
Death and Burial:
First Lieutenant Quentin Roosevelt was killed in action on 14 July 1918. He is buried next to his brother, Brigadier General Theodore Roosevelt, Jr., at the U.S. Military Cemetery, Colville-ser-Mer, Omaha Beach, Normandy, France.

Source: Military Hall of Honor
He was the youngest son of President Theodore Roosevelt and was a pursuit pilot during WWI. He was killed in aerial combat over France behind German lines and was buried by the German Military but was later moved to the Normandy American Cemetery and is buried next to his brother, Theodore Roosevelt, Jr. He also has a cenotaph located in Sagamore Hill National Historic Site, Oyster Bay, Nassau County, New York, USA.