Sir William George Granville Venables Vernon Harcourt (1827-1904) was the son of William Vernon Harcourt and his wife Matilda Mary Vernon Harcourt. He was educated by private tutors and at Trinity College, Cambridge. He entered Lincoln's Inn in 1851 and was called to the Bar three years later. In 1868 he entered Parliament as Liberal member for Oxford and from that date devoted himself to politics. He served as Home Secretary, 1880-5, and as Chancellor of the Exchequer, 1886, and 1892-5. (See ODNB for a full biography).

Lewis ('Loulou') Vernon Harcourt, 1st Viscount Harcourt (1863-1922) was his father Sir William Harcourt's close and constant companion, his mother Marie Therese (nèe Lister) having died when he was born. Following his schooling at Eastbourne and then Eton College, he settled in the role of his father's private secretary until Sir William's death in 1904. Lewis Harcourt was first elected to the House of Commons in March 1904 as the Liberal MP for Rossendale. He twice served as Commissioner of Works, 1905-10 and 1915-16, and served as Secretary of State for the Colonies, 1910-15. He was created Viscount Harcourt in 1917. He married Mary Ethel, daugther of Walter Hayes Burns in July 1899. They had one son William Edward Harcourt, 2nd Viscount Harcourt, and three daughters. (See ODNB for a full biography).

Edward William Harcourt (1825-91) the eldest son of William Vernon Harcourt and his wife Matilda Mary Vernon Harcourt. He served as MP for Oxford, 1878-86. He married Lady Susan (d.1894), daughter of George Holroyd, 2nd Earl of Sheffield, in June 1849. They had one son Aubrey Harcourt (1852-1904) and a daughter Edith (1853-1944), who married Murray Finch-Hatton, 12th Earl of Winchilsea and 7th Earl of Nottingham.