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His parents were Georg Anton, Count of Hoyos (1842–1904) and Alice Whitehead, who was the daughter of Robert Whitehead, the British engineer and inventor of the torpedo.
On 8 July 1862 at Ottenstein, Germany, he married Countess Theresia von Lamberg, the second child and only daughter of Franz Philipp, Count von Lamberg and Countess Caroline Hoyos.
On 21 June 1892 in Vienna he married Countess Marguerite Hoyos, a member of the originally Spanish magnate family of Hoyos from Hungary, who herself was half-English and a granddaughter of Robert Whitehead, the inventor of the torpedo.