Question: Who is Lionel Sackville-West, 3Rd Baron Sackville's child-in-law?

Knowledge 1: Lionel Sackville-West, 3rd Baron Sackville
Lionel Edward Sackville-West, 3rd Baron Sackville (15 May 1867 – 28 January 1928), was a British peer.Sackville-West was the son of the Honourable William Edward Sackville-West, sixth son of George Sackville-West, 5th Earl De La Warr and Lady Elizabeth Sackville.His mother was Georgina, daughter of George Dodwell.He inherited the barony in 1908 on the death of his uncle, the diplomat Lionel Sackville-West, 2nd Baron Sackville.In April 1912, Lord Sackville was appointed a deputy lieutenant of Kent.He married his first cousin Victoria Sackville-West (1862–1936) in 1892, illegitimate daughter of the second Baron, in 1890.Their daughter was the novelist and poet Vita Sackville-West. [SEP] Knowledge 2: Vita Sackville-West
Victoria Mary Sackville-West, Lady Nicolson, CH (9 March 1892 – 2 June 1962), usually known as Vita Sackville-West, was an English poet, novelist, and garden designer.She was a successful novelist, poet, and journalist, as well as a prolific letter writer and diarist.She published more than a dozen collections of poetry during her lifetime and 13 novels.She was twice awarded the Hawthornden Prize for Imaginative Literature: in 1927 for her pastoral epic, "The Land", and in 1933 for her "Collected Poems".She was the inspiration for the androgynous protagonist of , by her famous friend and lover, Virginia Woolf.She had a longstanding column in "The Observer" (1946–1961) and is remembered for the celebrated garden at Sissinghurst created with her husband, Sir Harold Nicolson.
Knowledge 1: Lionel Sackville-West, 3rd Baron Sackville
Lionel Edward Sackville-West, 3rd Baron Sackville (15 May 1867 – 28 January 1928), was a British peer.Sackville-West was the son of the Honourable William Edward Sackville-West, sixth son of George Sackville-West, 5th Earl De La Warr and Lady Elizabeth Sackville.His mother was Georgina, daughter of George Dodwell.He inherited the barony in 1908 on the death of his uncle, the diplomat Lionel Sackville-West, 2nd Baron Sackville.In April 1912, Lord Sackville was appointed a deputy lieutenant of Kent.He married his first cousin Victoria Sackville-West (1862–1936) in 1892, illegitimate daughter of the second Baron, in 1890.Their daughter was the novelist and poet Vita Sackville-West. [SEP] Knowledge 2: Charles Sackville-West, 6th Earl De La Warr
Major- General Charles Richard Sackville- West, 6th Earl De La Warr( 13 November 1815 – 23 April 1873), styled Lord West between 1850 and 1869, was a British soldier.Sackville- West was the second son of George Sackville- West, 5th Earl De La Warr, and Lady Elizabeth Sackville, daughter of John Sackville, 3rd Duke of Dorset.He was the brother of George West, Viscount Cantelupe, Reginald Sackville, 7th Earl De La Warr, Elizabeth Russell, Duchess of Bedford, Mortimer Sackville- West, 1st Baron Sackville, and Lionel Sackville- West, 2nd Baron Sackville.He was educated at Harrow.Sackville- West served in the British Army and was appointed aide- de- camp and military secretary to Sir Hugh Gough in India in 1845.He fought at the Battle of Sobraon in 1846 during the First Anglo- Sikh War.In 1850 he became known by the courtesy title Lord West after the death of his elder brother, Lord Cantelupe.Promoted to major in 1852 and to lieutenant- colonel in 1855, he served in the Crimean War.He was appointed a Companion of the Order of the Bath in 1855 and an Officer of the Legion of Honour in 1856 and awarded the Order of the Medjidie in 1858.In 1864 he was promoted to major- general.He succeeded his father in the earldom in 1869.In 1871 he was made a Knight Commander of the Order of the Bath( KCB).Lord De La Warr died in April 1873, aged 57, by drowning himself in the River Cam.He was unmarried and was succeeded in the earldom by his younger brother, Reginald, Lord Buckhurst.
Knowledge 1: Lionel Sackville-West, 3rd Baron Sackville
Lionel Edward Sackville-West, 3rd Baron Sackville (15 May 1867 – 28 January 1928), was a British peer.Sackville-West was the son of the Honourable William Edward Sackville-West, sixth son of George Sackville-West, 5th Earl De La Warr and Lady Elizabeth Sackville.His mother was Georgina, daughter of George Dodwell.He inherited the barony in 1908 on the death of his uncle, the diplomat Lionel Sackville-West, 2nd Baron Sackville.In April 1912, Lord Sackville was appointed a deputy lieutenant of Kent.He married his first cousin Victoria Sackville-West (1862–1936) in 1892, illegitimate daughter of the second Baron, in 1890.Their daughter was the novelist and poet Vita Sackville-West. [SEP] Knowledge 2: Victoria Sackville-West, Baroness Sackville
Victoria Josefa Dolores Catalina Sackville- West, Baroness Sackville( 23 September 1862 – 30 January 1936) married her first cousin Lionel Edward Sackville- West, 3rd Baron Sackville.Their daughter was the writer, poet and gardener Vita Sackville- West.The family lived mainly at Knole House, an estate that had been in the Sackville family for centuries.Victoria, having experienced a controversial life herself, has since been mostly displaced in the public's consciousness by the colourful life of her daughter Vita.

Answer: Harold Nicolson