In June 1930, she married
James Roosevelt II (1907–1991), the eldest son of then
Governor of New York, and eventual
President of the United States,
Franklin Delano Roosevelt and
Anna Eleanor Roosevelt. After her father-in-law became president, her husband served his father as an aide at the
White House, and she often stood-in as hostess at the White House when Eleanor was absent. When FDR entertained King
George VI and
Queen Elizabeth at a picnic at the Roosevelt estate in Hyde Park, New York in 1939, she was present and accompanied FDR as he drove the King and Queen along the
Hudson River. She and James had two daughters: •
Sara Delano Roosevelt (March 13, 1932 – October 22, 2021), who married
Anthony di Bonaventura (1929–2012) in 1953. They divorced in 1972 and she married Ronald A. Wilford (1927–2015) in 1973. • Kate Roosevelt (1936–2002), later known as Kate Whitney after her stepfather adopted her. In 1938, James left for Hollywood to work as an aide to
Samuel Goldwyn. Betsey followed him, but they divorced in 1940. She was granted custody of their daughters, along with child support, though by biographers' accounts, James had little to no contact with his children, and eventually married three more times. who had been previously married to socialite
Elizabeth Altemus. Whitney adopted both of her daughters. They moved to London in 1957, when President
Dwight D. Eisenhower named Whitney Ambassador to the
Court of St. James's. During the 1970s, Whitney was listed as one of the ten wealthiest men in the world. Their residences over the years included the
Greentree estate on Long Island;
Greenwood Plantation in
Georgia; a town house and an elegant apartment in Manhattan; a large summer house on
Fishers Island, near
New London, Connecticut; a 12-room house in
Saratoga Springs, which the Whitneys used when they attended horse races there; a golfing cottage in Augusta, Georgia; and a spacious house,
Cherry Hill, in
Virginia Water,
Surrey, England, near the
Ascot racecourse. In addition, the Whitneys shared a Kentucky horse farm with Whitney's sister,
Joan Whitney Payson. Her personal fortune was estimated at $700 million in 1990 according to
Forbes magazine. Her estate bequeathed eight major paintings to the
National Gallery of Art. ==Art owned==