Children of Edward Dominic O'Brien and Mary Carrick: • Murrough O'Brien (1756 - 10 Feb 1808) • Lady Mary O'Brien (1759 - 23 Jan 1840) Married first to
Sir Richard Eyre Cox, 4th Baronet, son of
Sir Michael Cox, 3rd Baronet, and Hon. Elizabeth Massy. They had one daughter. Married second to Rt. Hon.
William Saurin,
Attorney-General for Ireland, and had four sons and one daughter. •
William O'Brien, 2nd Marquess of Thomond (1765 - 21 Aug 1846) •
James O'Brien, 3rd Marquess of Thomond (1769 - 3 Jul 1855) •
Captain John O'Brien (1770–1833) • Lady Harriet O'Brien (1782 - 1 May 1851) Married to Sir Joseph Wallis Hoare,
3rd Baronet, son of Sir Edward Hoare, 2nd Baronet, and Clotilda Wallis. They had five sons and eight daughters. •
Captain Edward O'Brien
RN (1780 - 9 Mar 1824) Married first to Diana Hotham, daughter of General
George Hotham and Diana Pennyman. Married second to Gertrude Grace Methuen, daughter of
Paul Methuen, 1st Baron Methuen and Matilda
Gooch. They had two daughters. Married third to Lady Elizabeth Susan Somerset, daughter of
Henry Somerset, 6th Duke of Beaufort and Lady Charlotte Sophia
Leveson-Gower. They had one son. Edward Jr. also had at least one son out of wedlock. ==References==