| | William Henry Cavendish-Bentinck 3. Duke of Portland 1738–1809 Dorothy Cavendish (Lady) 1750–1794 | | | | William Bentinck 2. Duke of Portland 1709–1762 Margaret Harley (Lady) 1715–1785 | | | | Henry Bentinck 2. Earl of Portland & 1. Duke of Portland 1682–1726 Elizabeth „Lady“ Noel 1688–1737 | | | | John William Bentinck 1. Earl of Portland 1648–1709 Jane Martha Temple 1672–1751 Anne Frances Villiers 1655–1688 | | |
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| | | William Cavendish 4. Duke of Devonshire 1720–1764 Charlotte Elizabeth Boyle Baroness Clifford of Londesborough 1731–1754 |
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