| | | | | | | | William Cowper
(d. 1664)
1st Baronet of Ratling Court in the County of Kent | | Martha Master |
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| | | | Joyce Hukeley
(1622–1669) | | John Cowper
(1613–1643) | | Sir Samuel Holled
(1619–1661) | | Anne Cowper
(d. 1664) | |
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| | | | | | | | William Cowper
(1639–1706)
2nd Baronet of Ratling Court | | Sarah Cowper
(1644–1720) |
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| | | | Baron Cowper of Wingham in the County of Kent, 1706
Earl Cowper and Viscount Fordwich, in the County of Kent, 1718 | | | | | | | | | | | | | | | | | | | | | | | |
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Elizabeth Culling
(1676–1703) | | William Cowper
(1665–1723)
1st Earl Cowper, 1st Viscount Fordwich, 3rd Baronet of Ratling Court | | | 1) Judith Booth
(d. 1705) | | | 2) Mary Clavering
(1685–1724) | | Samuel Cowper
(1666) | | John Cowper
(1667–1686) | | Spencer Cowper
(1670–1728) | | Pennington
Goodere
(1667–1727) |
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William Cowper
(1697–1719) | | Mary Cowper
(1700–1740) | | William Cowper
(1687–1692?) | | | William Cowper
(1689–1740) | | Spencer Cowper
(1690) | | Spencer Cowper
(1691–1706) | | John Cowper
(1694–1756) | | Ashley Cowper
(1701–1768) | | Judith Madan
(1702–1781) |
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Sarah Cowper
(1707–1764) | | William Clavering-Cowper
(1709–1764)
2nd Earl Cowper, 2nd Viscount Fordwich, 4th Baronet of Ratling Court | | Anne Cowper
(1710–1764) | | Spencer Cowper
(1713–1774) | | William Cowper
(1731–1800) |
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| | | | George Nassau Clavering-Cowper
(1738–1789)
3rd Earl Cowper, 3rd Viscount Fordwich, 5th Baronet of Ratling Court |
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| | | | George Augustus Clavering-Cowper
(1776–1799)
4th Earl Cowper, 4th Viscount Fordwich, 6th Baronet of Ratling Court | | Peter Leopold Louis Francis Nassau
(1778–1837)
5th Earl Cowper, 5th Viscount Fordwich, 7th Baronet of Ratling Court |
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| | | | | | | | George Augustus Frederick Cowper
(1806–1856)
6th Earl Cowper, 6th Viscount Fordwich, 8th Baronet of Ratling Court |
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| | | | | | | | Francis Thomas de Grey Cowper
(1834–1905)
7th Earl Cowper, 7th Viscount Fordwich, 8th Baron Lucas, 3rd Baron Butler, 9th Baronet of Ratling Court, 4th Lord Dingwall | | Florence Amabell Herbert | | Auberon Edward William Molyneux Herbert
(1838–1906)
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| | | | | | | | Earldom of Cowper, Viscountcy of Fordwich, Barony of Cowper, Baronetcy of Ratlingcourt extinct, 1905 | | | | | | | | | | | |
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| | | | | | | | | | | | Auberon Thomas Herbert
(1876–1916)
9th Baron Lucas, 5th Lord Dingwall | | Nan Ino Cooper
(1880–1958)
10th Baroness Lucas, 6th Lady Dingwall |
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| | | | | | | | | | | | | | | | Anne Rosemary Palmer
(d. 1991)
11th Baroness Lucas, 7th Lady Dingwall |
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| | | | | | | | | | | | | | | | Ralph Matthew Palmer
(b. 1951)
12th Baron Lucas, 8th Lord Dingwall |
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