[2] After his death in 1911, his mother remarried in 1914 to Fitch Gilbert Jr., a Harvard and Columbia Law School graduate and farmer.
His grandmother, Helen Celia (née Ford) Bostwick, upon her death in April 1920, left to him a sum of $1,156,818.
[5] Bostwick rode horses from a young age, taught by his uncle F. Ambrose Clark, and became a successful amateur steeplechase rider in the United States and in England.
[8] Before their divorce, they lived on the 15th floor of the Rosario Candela designed 778 Park Avenue (the apartment, a floor below Brooke Astor's apartment, was later owned by Roone Arledge),[4] and had one son together:[9] The Bostwick's had an estate in Old Westbury on the north shore of Long Island.
[11] The estate featured an 1888 Georgian revival manor house with 18 rooms that was updated by architect James O'Connor in the 1930s.