Title: Viewpark
Content: Margaret, Duchess of Douglas, was daughter of James Douglas of Mains (12th) and obtained her title by marriage to Archibald Douglas, 1st Duke of Douglas (part of the Red Douglas family, and a distant relation). Margaret and Archibald married late in life, did not have children, and the title of Duke of Douglas became extinct on Archibald's death. The estates of Douglas became the subject of a legal battle (known as the Douglas Cause) between Archibald Steuart (the Duke of Douglas' nephew) and the Duke of Hamilton, who inherited the remaining titles of Douglas. Margaret supported Archibald, who was granted the estates 
Title: Douglas of Mains
Content:  Margaret, Duchess of Douglas, was daughter of James Douglas of Mains (12th) and obtained her title by marriage to Archibald Douglas, 1st Duke of Douglas (part of the Red Douglas family, and a distant relation). Margaret and Archibald married late in life, did not have children, and the title of Duke of Douglas became extinct on Archibald's death. The estates of Douglas became the subject of a legal battle (known as the Douglas Cause) between Archibald Steuart (the Duke of Douglas' nephew) and the Duke of Hamilton, who inherited the remaining titles of Douglas. Margaret supported Archibald, who was granted the estates after appeal to the House of Lords. In her will, she left money to purchase lands to be called Douglas-Support.
Title: Margaret Elizabeth Douglas
Content:  Douglas was born in Poplar, London on 22 August 1934; she was the only child of the Metropolitan Police constable Thomas Mincher Douglas and his wife, the teacher Dorothy May, Jones. Douglas grew up in Islington and liked to refer to herself as a "Blitz kid", apart from a year staying with her grandmother in Glasgow before returning to London. She was taught at Parliament Hill Grammar School, which she left at the age of 17, to the disappointment of the school because she knew the only advantage for a woman hold a degree in that era would put her on the road to becoming a teacher, which had no appeal to her and did not want to be a burden to her parents.
Title: Margaret Elizabeth Douglas
Content:  She was appointed the OBE in 1994. Douglas married the political journalist Terence Lancaster on 25 April 2000. She died of cancer at the Cromwell Hospital, Kensington on 20 August 2008. Douglas had no children but was stepmother to Lancaster's two sons.
Title: Douglas (surname)
Content:  Earl of Douglas ; Margaret, Duchess of Douglas ; Margaret Douglas (1515–1578), the daughter of Archibald Douglas, 6th Earl of Angus, and Margaret Tudor ; Margaret Douglas, Fair Maid of Galloway (died c. 1474), Scottish noblewoman, a member of the Black Douglas family ; Percy Douglas, 10th Marquess of Queensberry (1868–1920), son of the 9th Marquess of Queensberry ; Robert Douglas, 8th Earl of Morton (died 1649), son of the 7th Earl of Morton ; Robert Douglas, Viscount Belhaven(executed 1584), Gentlemen of the Bedchamber ; Sholto Douglas (d.unknown), mythical progenitor of the House of Douglas ; Sholto Douglas, 19th Earl of Morton (1844–1935), son of 
Title: Lady Margaret Douglas-Home
Content:  In 1931, Lady Margaret married Hon. Henry Montagu Douglas-Home (1907–1980), second son of the Charles Douglas-Home, 13th Earl of Home and a brother of Alec Douglas-Home, who served as Prime Minister of the United Kingdom in 1963–1964. The marriage was dissolved in 1947. They had two sons, Robin (died 1968) and Charles (died 1985). Their daughter Fiona married first Gregory Martin and secondly the merchant banker Sir Ian James Fraser (1923–2003), former chairman of Lazard. Lady Margaret was a great-aunt of Diana, Princess of Wales, and a close friend of Queen Elizabeth The Queen Mother. She died at Wells-next-the-Sea, Norfolk, in 1996.
Title: Margaret Douglas
Content:  Margaret was born at Harbottle Castle in Northumberland on 8 October 1515. Her mother had crossed the border from Scotland when her father was facing difficulties in Scotland. In October 1528, Angus was threatened by James V of Scotland and sent Margaret back over the River Tweed into England at Norham Castle. After a brief stay at Berwick Castle accompanied by her nurse or 'gentlewoman' Isobel Hoppar, Margaret joined the household of her godfather, Cardinal Wolsey. When Wolsey died in 1530, Lady Margaret was invited to the royal Palace of Beaulieu, where she resided in the household of Princess Mary. Because of her nearness to the English crown, Lady Margaret 
Title: Margaret, Countess of Mar
Content:  Margaret of Mar (died c. 1391) was Countess of Mar, an ancient earldom in Scotland, in her own right. She was a daughter of Domhnall II of Mar and after the death of her childless brother Thomas became Countess of Mar. She had married William Douglas, 1st Earl of Douglas, who was succeeded by their son, James Douglas, 2nd Earl of Douglas and Earl of Mar and Garioch in right of his mother. But he was killed in 1388, leading the Scots at the Battle of Otterburn. Margaret was succeeded by her daughter, Isabel, who became Countess of Mar, possessed the Lordship of the Garioch, and also became the Countess of the unentailed lands of the House of Douglas.
Title: Margaret Douglas, Fair Maid of Galloway
Content:  Margaret Douglas, Countess of Douglas (died c. 1474), known as the Fair Maid of Galloway, was a Scottish noblewoman, a member of the Black Douglas family towards the end of the family's position as a major force in Scotland. She was the daughter of Archibald Douglas, 5th Earl of Douglas, and Eupheme Graham, daughter of Patrick Graham, Earl of Strathearn and Euphemia Stewart, Countess of Strathearn. She acquired Galloway when her two brothers (one of whom was William Douglas, 6th Earl of Douglas) were murdered at the Black Dinner in Edinburgh Castle. She married her cousin William Douglas, 8th Earl of Douglas. When he was assassinated she obtained permission to marry his brother, James Douglas, 9th Earl of Douglas, but it is not entirely clear that the marriage ever happened, if it did it must have ended in divorce since they both married again. She then married John Stewart, 1st Earl of Atholl. She had no children by the Earls of Douglas, but two daughters by the Earl of Atholl. These were Janet, wife of Alexander Gordon, 3rd Earl of Huntly and Elizabeth, wife of Andrew Gray, 2nd Lord Gray. They both had issue by their respective husbands.
Title: Margaret Douglas
Content:  Margaret Douglas is known for her poetry. Many of her works are written to her lover, Lord Thomas Howard, and are preserved in the Devonshire MS. Her close friends, Mary Shelton and the Duchess of Richmond, were the main contributors, as well as Henry Howard, Earl of Surrey and Thomas Wyatt.

Question: Who is the mother of Margaret Douglas?
Answer: Margaret Tudor.