American engineer, banker, soldier, and municipal official who was the youngest brother of First Lady of the United States Eleanor Roosevelt and a nephew of President Theodore Roosevelt.
He was a son of Elliot Roosevelt (who died when he was three years old) and Anna Rebecca Hall (who died when he was one-and-a-half years old). His uncle was Theodore Roosevelt Jr. and his grandmother was Martha Bulloch. Through his sister, Eleanor, Franklin Delano Roosevelt was his brother-in-law, and through his father, his fifth cousin once removed. He was also the uncle of U.S. Air Force Brigadier General Elliott Roosevelt. He was named Gracie for his father’s aunt, Anna Bulloch and her husband James Gracie, and Hall for his mother’s family.
Before his death, Eleanor’s father had implored her to act as a mother towards her toddler brother, and it was a request she made good upon for the rest of Hall’s life. After his father’s death, Hall and Eleanor were reared by their grandmother at her estate in Tivoli, New York. Eleanor took pleasure in Hall’s brilliant performance at school, and was proud of his many academic accomplishments, which included a master’s degree in engineering from Harvard in 1913.
Hall Roosevelt married twice and had three children with each wife. He spent the last few years of his life in a small building on the Hyde Park estate, and he died in Washington, D.C. on 25 September 1941 at age 50. Eleanor Roosevelt survived her brother by 21 years.
Link to Wikipedia biography