Major Jack Montagu Hillyard (2 January 1891 – 16 February 1983) played cricket for Harrow in Fowler's match in 1910, served in the British Army in the First World War, and became a moderately successful tennis player in the 1920s and 1930s.
His younger sister Marjorie was born in 1896, in the Hillyard's house "The Elms" in Thorpe Satchville, Leicestershire.
Hillyard served in the Royal Field Artillery in the First World War, spending four years in France and reaching the rank of major.
He lost the final of the All England Plate in 1924 to Jack Condon, but won the Surrey Grass Court Championships that year.
She was the daughter of French author Léon Brethous-Lafargue and divorced wife of Pedro Frederico Vaz de Carvalhaes.