Arthur Cavendish-Bentinck was born 9 May 1819 in London, England, United Kingdom to William Charles Augustus Cavendish-Bentinck (1780-1826) and Anne Wellesley (1788-1875) and died 11 December 1877 of unspecified causes. He married Elisabeth Sophia Hawkins-Whitshed (c1830-1858) 18 February 1857 . He married Augusta Mary Elizabeth Browne, 1st Baroness Bolsover (1834-1893) 10 June 1862 .
|Offspring of Arthur Cavendish-Bentinck and Elisabeth Sophia Hawkins-Whitshed (c1830-1858)|
|William Cavendish-Bentinck, 6th Duke of Portland (1857-1943)||28 December 1857||26 April 1943||Winifred Anna Dallas-Yorke (1863-1954)|
|Offspring of Arthur Cavendish-Bentinck and Augusta Mary Elizabeth Browne, 1st Baroness Bolsover (1834-1893)|
|Henry Cavendish-Bentinck (1863-1931)|
|William Augustus Cavendish-Bentinck (1865-1903)|
|Charles Cavendish-Bentinck (1868-1956)|
|Ottoline Violet Ann Cavendish-Bentinck (1873-1938)||16 June 1873||21 April 1938||Philip Edward Morrell (1870-1943)|