Tracing Douglas family roots - unraveling history, one generation at a time.
- 1683
| Margaret (Countess Hillsborough) Fitzgerald | |
| D: | 19 Jan 1766 |
 | William (1st Marquess of Downshire) Hill 1718-1793 |
| William (1st Marquess of Downshire) Hill | |
| B: | 30 May 1718 |
| D: | 7 Oct 1793 |
| James (1st Duke of Leinster) Fitzgerald 1722-1773 |
| James (1st Duke of Leinster) Fitzgerald | |
| B: | 29 May 1722 |
| D: | 19 Nov 1773 |
| Emilia Mary Lennox 1731-1814 |
| Emilia Mary Lennox | |
| B: | 6 Oct 1731 |
| M: | 7 Feb 1747 |
| D: | 27 Mar 1814 |
| Mary (of Inchiquin) O'brian 1692-1780 |
| Mary (of Inchiquin) O'brian | |
| B: | 12 Feb 1692 |
| D: | 10 Feb 1780 |
| Robert (19Th Earl of Kildare) Fitzgerald 1675-1744 |
| Robert (19Th Earl of Kildare) Fitzgerald | |
| B: | 1675 |
| M: | 7 Mar 1709 |
| D: | 20 Nov 1744 |
| Mary (Countess of Orkney) O'brien 1733-Yes, date unknown |
| Mary (Countess of Orkney) O'brien | |
| B: | 12 Jan 1733 |
| D: | Yes, date unknown |
| William Lord O'brien 1725-Yes, date unknown |
| William Lord O'brien | |
| B: | 1725 |
| D: | Yes, date unknown |
| George Lord O'brien 1727-Yes, date unknown |
| George Lord O'brien | |
| B: | 8 Aug 1727 |
| D: | Yes, date unknown |
| Murrough (4th Viscount Kirkwall) O'brien 1731-1741 |
| Murrough (4th Viscount Kirkwall) O'brien | |
| B: | Nov 1731 |
| D: | 20 Sep 1741 |
| William (4th Earl of Inchiquin) O'brien 1694-1777 |
| William (4th Earl of Inchiquin) O'brien | |
| B: | 1694 |
| D: | 18 Jul 1777 |
| Anne (Countess of Orkney) Hamilton 1694-1756 |
| Anne (Countess of Orkney) Hamilton | |
| B: | 1694 |
| M: | 29 Mar 1720 |
| D: | 6 Dec 1756 |
| William (3rd Earl of Inchiquin) O'brien Abt 1666-1719 |
| William (3rd Earl of Inchiquin) O'brien | |
| B: | Abt 1666 |
| D: | 24 Dec 1719 |
| Mary Villiers -1753 |
| Mary Villiers | |
| M: | Apr 1691 |
| D: | 17 Apr 1753 |
| Henry O'brien -Yes, date unknown |
| Henry O'brien | |
| D: | Yes, date unknown |
| James O'brien -Yes, date unknown |
| James O'brien | |
| D: | Yes, date unknown |
| Margaret O'brien -Yes, date unknown |
| Margaret O'brien | |
| D: | Yes, date unknown |
|
| Margaret (of Orrery) Boyle | |
| D: | 1683 |
| William (2nd Earl of Inchiquin) O'brien 1638-1691 |
| William (2nd Earl of Inchiquin) O'brien | |
| B: | 1638 |
| M: | 1665 |
| D: | 1691 |
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