William Cavendish-Bentinck, 6th Duke of Portland, was born 28 December 1857 to Arthur Cavendish-Bentinck (1819-1877) and Elisabeth Sophia Hawkins-Whitshed (c1830-1858) and died 26 April 1943 of unspecified causes. He married Winifred Anna Dallas-Yorke (1863-1954) 11 June 1889 .
|Offspring of William Cavendish-Bentinck, 6th Duke of Portland and Winifred Anna Dallas-Yorke (1863-1954)|
|Victoria Alexandrina Violet Cavendish-Bentinck (1890-1994)|
|William Arthur Henry Cavendish-Bentinck, 7th Duke of Portland (1893-1977)||16 March 1893 Mayfair, London, England, United Kingdom||21 March 1977 Nottinghamshire, England, United Kingdom||Ivy Gordon-Lennox (1887-1982)|
|Francis Morven Dallas Cavendish-Bentinck (1900-1950)|