Matilda White 
From 22 June 1826, her married name became Massy. After her marriage, Matilda White was styled as Baroness Massy of Duntrileague on 22 June 1826.
Children of Matilda White and Hugh Hamon Massy, 4th Baron Massy of Duntrileague
- Hugh Hamon Ingoldsby Massy, 5th Baron Massy of Duntrileague2 b. 14 Apr 1827, d. 27 Feb 1874
- John Thomas William Massy, 6th Baron Massy of Duntrileague+2 b. 30 Aug 1835, d. 28 Nov 1915
John Nigel Henry Napier Phillips1 
Hugh Hamon Ingoldsby Massy, 5th Baron Massy of Duntrileague1 
He succeeded as the 5th Baron Massy of Duntrileague, co. Limerick [I., 1776] on 27 September 1836.1
Isabella Nisbett1 
After her marriage, Isabella Nisbett was styled as Baroness Massy of Duntrileague on 4 January 1855. From 4 January 1855, her married name became Massy.
William David Hamilton More Nisbett1
Children of William David Hamilton More Nisbett and Charlotte F. D. Davidson
- North David Monnington More Nisbett1 b. 18 Sep 2017
- Claudia Iveigh D’Oyly More Nisbett2 b. 3 Dec 2018
- [S1122] Peerage News, online http://peeragenews.blogspot.co.nz/. Hereinafter cited as Peerage News.
- [S466] Notices, The Telegraph, London, UK. Hereinafter cited as The Telegraph.
Hugh Somerset John Massy, 7th Baron Massy of Duntrileague1 
He succeeded as the 7th Baron Massy of Duntrileague, co. Limerick [I., 1776] on 28 November 1915.1
Children of Hugh Somerset John Massy, 7th Baron Massy of Duntrileague and Ellen Ida Constance Wise
- Hon. Ida Lucy Massy2 b. 16 Sep 1887, d. 1957
- Hon. Muriel Olive Massy2 b. 21 Jun 1892
- unnamed daughter Massy2 b. 14 Jun 1893, d. 14 Jun 1893
- Hugh Hamon Charles George Massy, 8th Baron Massy of Duntrileague+2 b. 13 Jul 1894, d. 20 Mar 1958
- Hon. Francis John Ingoldsby Tristram Massy+2 b. 6 Jul 1895, d. 24 Nov 1929
- Hon. Lilian Ierne Susan Massy2 b. 29 Dec 1897
Ellen Ida Constance Wise1 
From 16 September 1886, her married name became Massy. After her marriage, Ellen Ida Constance Wise was styled as Baroness Massy of Duntrileague on 28 November 1915.
Children of Ellen Ida Constance Wise and Hugh Somerset John Massy, 7th Baron Massy of Duntrileague
- Hon. Ida Lucy Massy2 b. 16 Sep 1887, d. 1957
- Hon. Muriel Olive Massy2 b. 21 Jun 1892
- unnamed daughter Massy2 b. 14 Jun 1893, d. 14 Jun 1893
- Hugh Hamon Charles George Massy, 8th Baron Massy of Duntrileague+2 b. 13 Jul 1894, d. 20 Mar 1958
- Hon. Francis John Ingoldsby Tristram Massy+2 b. 6 Jul 1895, d. 24 Nov 1929
- Hon. Lilian Ierne Susan Massy2 b. 29 Dec 1897
Charles William Wise1
Child of Charles William Wise
- Ellen Ida Constance Wise+2 d. 1922
Hon. Lucy Matilda Anne Massy1 
From 13 November 1889, her married name became Guinness.
Children of Hon. Lucy Matilda Anne Massy and Colonel Charles Davis Guinness
- Hugh Spencer Guinness2 b. 7 Oct 1890, d. 20 Sep 1922
- Major Owen Charles Guinness+2 b. 14 Sep 1894, d. 11 Dec 1970
Colonel Charles Davis Guinness1 
He was educated at Eton College, Windsor, Berkshire, EnglandG.2 He fought in the Boer War between 1899 and 1902, where he was mentioned in despatches.2 He gained the rank of Brevet-Colonel in the Royal Artillery.2 He held the office of High Sheriff of County Louth in 1918.2 He lived at Tibradden House, County Dublin, Ireland.3 He had three other sons and two other daughters, all of whom died unmarried.2
Children of Colonel Charles Davis Guinness and Hon. Lucy Matilda Anne Massy
- Hugh Spencer Guinness2 b. 7 Oct 1890, d. 20 Sep 1922
- Major Owen Charles Guinness+2 b. 14 Sep 1894, d. 11 Dec 1970
