Franklin III Roosevelt

American retired economist and academic from a noted family who refers to himself as a "radical" or "alternative" economist. Through his father, he is a grandson of U.S. President Franklin D. Roosevelt and his wife Eleanor Roosevelt, and through his mother, he is related to the prominent du Pont family.

He has a younger brother, Christopher du Pont Roosevelt, born 1941, also from his parents' marriage. From his father's later marriages (who married 5 times in total), he has two younger half-sisters, Nancy Suzanne Roosevelt (born 1952) and Laura Delano Roosevelt (born 1959), and a younger half-brother, John Alexander Roosevelt (born 1977). He also had a younger half-brother, Benjamin S. Warren III (born 1954), from his mother's later marriage to attorney Benjamin S. Warren, Jr.

On 18 June 1962, Roosevelt married Grace Rumsey Goodyear. They have three children, including a set of twins: Phoebe Louisa Roosevelt (born 25 February 1965), Nicholas Martin Roosevelt (born 8 June 1966, twin) and Amelia "Amie" Roosevelt (born 8 June 1966, twin), a concert violinist.