| 1. Henry William O'Brien
* 1822 | 2. Capt. Edward O'Brien
(Hotham , Methuen , Somerset ) + 1824 | 4. Edward O'Brien
(Carrick ) c. 1730 - 1800 | 8. James O'Brien
(Jephson ) + post 1730 | 16. William O'Brien
(O'Brien , Villiers ) 1666 - 1719 | 32. William O'Brien
(Boyle ) 1640 - 1692 |
| 33. |
| 17. Mary Villiers
(O'Brien ) c. 1657 - 1753 | 34. Sir Edward Villiers
(St John , Howard ) ante 1621 - 1689 |
| 35. Barbara St John
(Villiers , Villiers ) c. 1592 - 1672 |
| 9. Mary Jephson
(O'Brien ) * ante 1675 | 18. |
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| 19. Anne Barry
(Jephson ) | 38. |
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| 5. |
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| 3. Elizabeth Susan Somerset
(O'Brien ) * 1798 | 6. Henry Charles Somerset
(Leveson Gower ) 1766 - 1835 | 12. Henry Somerset
(Boscawen ) 1744 - 1803 | 24. Charles Noel Somerset
(Berkeley ) 1709 - 1756 | 48. Henry Somerset
(Sackville , Noel , Osborne ) 1684 - 1714 |
| 49. Rachel Noel
(Somerset ) + 1709 |
| 25. Elizabeth Berkeley
(Somerset ) 1719 - 1799 | 50. John Symes Berkeley
(Norborne ) + 1736 |
| 51. Elizabeth Norborne
(Berkeley ) |
| 13. Elizabeth Boscawen
(Somerset ) 1747 - 1828 | 26. Adml. Edward Boscawen
(Glanville ) + post 1747 | 52. Hugh Boscawen
+ 1734 |
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| 27. Frances Evelyn Glanville
(Boscawen ) 1719 - 1805 | 54. |
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| 7. Charlotte Sophia Leveson Gower
(Somerset ) 1771 - 1854 | 14. Granville Leveson Gower
(Fazakerly , Egerton , Stewart ) 1721 - 1803 | 28. John Leveson Gower
(Pierrepoint , Stonehouse , Tufton ) 1694 - 1754 | 56. |
| 57. |
| 29. Evelyn Pierrepoint
(Leveson Gower ) 1691 - 1727 | 58. Evelyn Pierrepoint
(Chudleigh , Feilding , Bentinck ) c. 1665 - 1726 |
| 59. |
| 15. Susannah Stewart
(Leveson Gower ) 1730 - 1805 | 30. Alexander Stewart
(Keith , Cochrane ) 1694 - 1773 | 60. James Stewart
(Montgomerie ) ante 1670 - 1746 |
| 61. Catherine Montgomerie
(Stewart ) + post 1706 |
| 31. Catherine Cochrane
(Stewart ) ante 1710 - 1786 | 62. John Campbell Cochrane
1687 - 1720 |
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