Question: What is the date of birth of Lord William Montagu-Douglas-Scott's father?

Knowledge 1: Lord William Montagu-Douglas-Scott
Lieutenant-Colonel Lord William Walter Montagu-Douglas-Scott (17 January 1896 – 30 January 1958) was a Scottish aristocrat and politician.The 2nd son of John Montagu Douglas Scott, 7th Duke of Buccleuch, he was educated at Eton College and at the Royal Military College, Sandhurst.He was commissioned into the 10th Hussars.Promoted Lieutenant in 1915, he won the Military Cross in 1918 and was shortly afterwards promoted Captain.From 1925 to 1926 he was ADC to the Governor-General of Canada.He retired in 1927.He rejoined the Army in the Second World War, serving in Italy and reaching the rank of Lieutenant-Colonel.He was Unionist Member of Parliament (MP) for Roxburgh and Selkirk from 1935 to 1950, taking over the seat from his elder brother Walter on the death of their father.In 1937 he married Lady Rachel Douglas Home (10 April 1910 – 4 Apr 1996), younger daughter of Charles Douglas-Home, 13th Earl of Home.The couple had one son and four daughters, and lived at Eildon Hall, St Boswells, Roxburghshire.His sister was Princess Alice, Duchess of Gloucester (1901 – 2004). [SEP] Knowledge 2: John Montagu Douglas Scott, 7th Duke of Buccleuch
John Charles Montagu Douglas Scott, 7th Duke of Buccleuch and 9th Duke of Queensberry, (30 March 1864 – 19 October 1935), styled The Honourable John Montagu Douglas Scott until 1884, Lord John Montagu Douglas Scott between 1884 and 1886 and Earl of Dalkeith until 1914 was a Scottish Member of Parliament and peer.
Knowledge 1: Lord William Montagu-Douglas-Scott
Lieutenant-Colonel Lord William Walter Montagu-Douglas-Scott (17 January 1896 – 30 January 1958) was a Scottish aristocrat and politician.The 2nd son of John Montagu Douglas Scott, 7th Duke of Buccleuch, he was educated at Eton College and at the Royal Military College, Sandhurst.He was commissioned into the 10th Hussars.Promoted Lieutenant in 1915, he won the Military Cross in 1918 and was shortly afterwards promoted Captain.From 1925 to 1926 he was ADC to the Governor-General of Canada.He retired in 1927.He rejoined the Army in the Second World War, serving in Italy and reaching the rank of Lieutenant-Colonel.He was Unionist Member of Parliament (MP) for Roxburgh and Selkirk from 1935 to 1950, taking over the seat from his elder brother Walter on the death of their father.In 1937 he married Lady Rachel Douglas Home (10 April 1910 – 4 Apr 1996), younger daughter of Charles Douglas-Home, 13th Earl of Home.The couple had one son and four daughters, and lived at Eildon Hall, St Boswells, Roxburghshire.His sister was Princess Alice, Duchess of Gloucester (1901 – 2004). [SEP] Knowledge 2: Walter Montagu Douglas Scott, 8th Duke of Buccleuch
Walter John Montagu Douglas Scott, 8th Duke of Buccleuch and 10th Duke of Queensberry,( 30 December 1894 – 4 October 1973) was a Scottish peer and Conservative politician.He was the son of John Montagu Douglas Scott, 7th Duke of Buccleuch and Lady Margaret Alice" Molly" Bridgeman.His sister, Alice, married Prince Henry, Duke of Gloucester( one of the paternal uncles of Queen Elizabeth II) in 1935, becoming a member of the British Royal Family.
Knowledge 1: Lord William Montagu-Douglas-Scott
Lieutenant-Colonel Lord William Walter Montagu-Douglas-Scott (17 January 1896 – 30 January 1958) was a Scottish aristocrat and politician.The 2nd son of John Montagu Douglas Scott, 7th Duke of Buccleuch, he was educated at Eton College and at the Royal Military College, Sandhurst.He was commissioned into the 10th Hussars.Promoted Lieutenant in 1915, he won the Military Cross in 1918 and was shortly afterwards promoted Captain.From 1925 to 1926 he was ADC to the Governor-General of Canada.He retired in 1927.He rejoined the Army in the Second World War, serving in Italy and reaching the rank of Lieutenant-Colonel.He was Unionist Member of Parliament (MP) for Roxburgh and Selkirk from 1935 to 1950, taking over the seat from his elder brother Walter on the death of their father.In 1937 he married Lady Rachel Douglas Home (10 April 1910 – 4 Apr 1996), younger daughter of Charles Douglas-Home, 13th Earl of Home.The couple had one son and four daughters, and lived at Eildon Hall, St Boswells, Roxburghshire.His sister was Princess Alice, Duchess of Gloucester (1901 – 2004). [SEP] Knowledge 2: Lord George Scott
Lord George William Montagu Douglas Scott,( 31 August 1866 – 23 February 1947) was a Scottish cricketer and soldier.He was the brother of John Montagu Douglas Scott, 7th Duke of Buccleuch and the son of William Montagu Douglas Scott, 6th Duke of Buccleuch.Princess Alice, Duchess of Gloucester was his niece.Scott was born in Bowhill, Selkirkshire, the third son of William Montagu Douglas Scott, 6th Duke of Buccleuch.He was educated at Eton and Christ Church, Oxford.He played first- class cricket for various teams including Middlesex, Marylebone Cricket Club( MCC) and Oxford University from 1884 to 1905.He represented the Gentlemen in the Gentlemen v Players series.He was also Master of the Buccleuch Hunt.Scott was commissioned a second lieutenant in the 10th Hussars on 27 March 1889, was promoted to the rank of lieutenant on 11 June 1890, and to captain on 25 June 1897.He served in the Second Boer War, and left the regular army in August 1902.He later commanded the 2/1st Lothians and Border Horse, a Yeomanry( later Territorial Army) regiment, through World War I until January 1919 when he retired.He was appointed OBE in the 1919 Birthday Honours.He was a Deputy Lieutenant of Roxburghshire.In 1903, Scott married Lady Elizabeth Manners( died 1924), the youngest daughter of the John Manners, 7th Duke of Rutland.Together they had two sons and three daughters.His eldest daughter, Georgina Mary Scott, married Raymond O' Neill, 4th Baron O'Neill in 1963.He died in Melrose, Scottish Borders.

Answer: 30 March 1864