John Jacob Astor IV IV was born on July 13, 1864 at his parents' country estate Ferncliff in Rhinebeck, New York. He was the youngest of five children and only son of businessman, collector, and race horse breeder/owner William Backhouse Astor, Jr. and socialite Caroline Webster "Lina" Schermerhorn. His four elder sisters were Emily, Helen, Charlotte, and Caroline ("Carrie"). He was a great-grandson of fur-trader John Jacob Astor and Sarah Cox Todd, whose fortune made the Astor family one of the wealthiest in the United States. Astor's paternal grandfather William Backhouse Astor, Sr. was a prominent real estate businessman. Through his paternal grandmother, Margaret
John Jacob Astor III and Sarah Cox Todd (1761–1842). His maternal grandparents were Senator John Armstrong, Jr. (1758–1843) and Alida Livingston (1761–1822) of the Livingston family. He was also a nephew of occasional poet John Jacob Astor, Jr. (1791–1869). John Astor studied at Columbia University and the University of Göttingen, following which he went to Harvard Law School. He practiced law for a year, to qualify for assisting in the management of his family's immense estate, one half of which later descended to him. It was based on his paternal grandfather's achieving a monopoly in the lucrative fur trade in the early nineteenth century.