| | | | | | | | | | | | John Howe |
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| | | | Howe baronets of Compton, 1660 | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | John Howe d. 1671 1st Baronet | | | | | | | | | | | | | | | | | | | | | | George Howe d. 1647 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Howe baronets of Cold Barwick, 1660 |
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| | | | Richard Howe 1621–1703 2nd Baronet | | John Grobham Howe 1625–1679 | | | | | | | | | | | | | | | | | | George Howe c. 1627–1676 1st Baronet |
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| | | | | | | | | Baron Glenawley, Viscount Howe (Ire), 1701 | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | Richard Howe c. 1651–1730 3rd Baronet | | Scrope Howe 1648–1713 1st Viscount Howe | | | | | | John Grubham Howe 1657–1722 | | Charles Howe 1661–1742 | | Emanuel Howe c. 1663–1709 | | James Howe c. 1669–1736 2nd Baronet |
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| | | | | | | | | | | | | | | | | | Baron Chedworth | | | | | | | | | | |
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| | | | John Howe died young | | Emanuel Howe c. 1700–1735 2nd Viscount Howe, 4th Baronet | | | | | | John Howe d. 1742 1st Baron Chedworth | | Three sons who died young | | Three sons without male issue |
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Baron Curzon, 1794 Viscount Curzon, 1802 | | | | | | | Viscount Howe (GB), 1782 Earl Howe (1st creation, GB) and Baron Howe, 1788 | | | | | | | | | | | | | | | | | | | | |
Assheton Curzon 1730–1820 1st Viscount Curzon, etc. | | George Howe c. 1725–1758 3rd Viscount Howe, 5th Baronet | | Richard Howe 1726–1799 Earl Howe, etc., 4th Viscount Howe (Ire), 1st Baron Howe, 6th Baronet | | William Howe 1729–1814 5th Viscount Howe (Ire), 5th Baron Glenawley, 7th Baronet | | John Howe 1714–1762 2nd Baron Chedworth | | Henry Howe 1716–1781 3rd Baron Chedworth | | Thomas Howe d. 1776 |
| | | | | | | | | Earldom Howe and viscountcy Howe (GB) extinct, 1799 | | Viscountcy Howe (Ire), barony Howe, and baronetcy Howe of Compton extinct, 1814 | | | | | | | | | | | | | |
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Penn Curzon 1757–1797 | | | | | | Sophia (Howe) Waller 1762–1835 2nd Baroness Howe | | | | | | | | | | | | | | John Howe 1754–1804 4th Baron Chedworth |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | Barony extinct, 1804 |
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| | | | | | | | | | Earl Howe (2nd creation, UK), 1821 |
George Howe 1788–1805 | | Leicester Howe 1792–1793 | | Richard Curzon-Howe 1796–1870 1st Earl Howe, 2nd Viscount Curzon, etc., 3rd Baron Howe |
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| | | | | | | | George Curzon-Howe 1821–1876 2nd Earl Howe, 3rd Viscount Curzon, etc. | | Richard Curzon-Howe 1822–1900 3rd Earl Howe, 4th Viscount Curzon, etc. |
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| | | | | | | | | | | | Richard Curzon 1861–1929 4th Earl Howe, 5th Viscount Curzon, etc. | | Frederick Curzon 1868–1920 |
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| | | | | | | | | | | | Francis Curzon 1884–1964 5th Earl Howe, 6th Viscount Curzon, etc. | | George Curzon 1898–1976 |
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| | | | | | | | | | | | Edward Curzon 1908–1984 6th Earl Howe, 7th Viscount Curzon, etc. | | Frederick Curzon b. 1951 7th Earl Howe, 8th Viscount Curzon, etc. |
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| | | | | | | | | | | | | | | | Thomas Curzon b. 1994 styled Viscount Curzon |