Descendants
Whitehead married Frances Maria Johnson (1821–1883), daughter of James Johnson and Ann Boville
He died in 1905 at Beckett Hall, Shrivenham, Berkshire, a country house he had leased from Viscount Barrington.
The couple's children include:
Alice Whitehead, who married Georg Anton, Count of Hoyos (1842–1904), and had issue.
Countess Marguerite of Hoyos married Prince Herbert von Bismarck, and from them descend most of the Bismarck family of today.
Alexander, Count of Hoyos.
Cavaliere (Knight) John Whitehead (1854–1902) married Countess Agathe Gobertina von Breunner (1856–1945), Austro-Hungarian nobility, and had issue:
Agathe Whitehead was the heiress of her grandfather's fortune. She had seven children with her husband Georg von Trapp. Captain von Trapp remarried after her death and became famous as the patriarch of the von Trapp Family Singers who were portrayed in the semi-fictional stage play and movie The Sound of Music.
Sir James Beethom Whitehead (1858–1928), diplomat, who married on 15 April 1896 the Hon. Marian Cecilia Brodrick, youngest daughter of the 8th Viscount Midleton, and had issue seven children including:
John William St John Whitehead (1901–1984), stockbroker and pre-WWII amateur aviator
Sir Edgar Cuthbert Fremantle Whitehead (1905–1971), who became Prime Minister of Southern Rhodesia
Hugh Laurence James Whitehead (d. 27 December 1945 in London).
Robert Boville Whitehead (1877–1945), who married and had issue
Frances Eleanor Whitehead (d. 1900) who married Admiral Sir Charles Carter Drury