Margaret Long1 
From February 1791, her married name became O’Brien.1
Children of Margaret Long and James O’Brien
- John O’Brien+1 b. 6 Dec 1794, d. 6 Feb 1855
- Peter O’Brien1 b. Sep 1797, d. 1855
- Terence O’Brien1 b. 1802, d. 1820
- James O’Brien1 b. 1806, d. 1882
- [S21] L. G. Pine, The New Extinct Peerage 1884-1971: Containing Extinct, Abeyant, Dormant and Suspended Peerages With Genealogies and Arms (London, U.K.: Heraldry Today, 1972), page 210. Hereinafter cited as The New Extinct Peerage.
Peter Long1
Child of Peter Long
- Margaret Long+1 d. 1839
- [S21] L. G. Pine, The New Extinct Peerage 1884-1971: Containing Extinct, Abeyant, Dormant and Suspended Peerages With Genealogies and Arms (London, U.K.: Heraldry Today, 1972), page 210. Hereinafter cited as The New Extinct Peerage.
Cornelius O’Brien1
- [S21] L. G. Pine, The New Extinct Peerage 1884-1971: Containing Extinct, Abeyant, Dormant and Suspended Peerages With Genealogies and Arms (London, U.K.: Heraldry Today, 1972), page 210. Hereinafter cited as The New Extinct Peerage.
Peter O’Brien1 
- [S21] L. G. Pine, The New Extinct Peerage 1884-1971: Containing Extinct, Abeyant, Dormant and Suspended Peerages With Genealogies and Arms (London, U.K.: Heraldry Today, 1972), page 210. Hereinafter cited as The New Extinct Peerage.
Emily Shiel1
Her married name became O’Brien.1
- [S21] L. G. Pine, The New Extinct Peerage 1884-1971: Containing Extinct, Abeyant, Dormant and Suspended Peerages With Genealogies and Arms (London, U.K.: Heraldry Today, 1972), page 210. Hereinafter cited as The New Extinct Peerage.
Edward Shiel1
Child of Edward Shiel
- [S21] L. G. Pine, The New Extinct Peerage 1884-1971: Containing Extinct, Abeyant, Dormant and Suspended Peerages With Genealogies and Arms (London, U.K.: Heraldry Today, 1972), page 210. Hereinafter cited as The New Extinct Peerage.
Terence O’Brien1 
- [S21] L. G. Pine, The New Extinct Peerage 1884-1971: Containing Extinct, Abeyant, Dormant and Suspended Peerages With Genealogies and Arms (London, U.K.: Heraldry Today, 1972), page 210. Hereinafter cited as The New Extinct Peerage.
James O’Brien1 
He was admitted to King’s Inn in 1830 entitled to practise as a Barrister-at-Law.1 He was appointed Queen’s Counsel (Q.C.) in 1841.1 He was a practising Serjeant in 1848.1 He held the office of Member of Parliament (M.P.) for Limerick between 1854 and 1858.1 He held the office of Judge of the Queen’s Bench [Ireland] in 1858.1
- [S21] L. G. Pine, The New Extinct Peerage 1884-1971: Containing Extinct, Abeyant, Dormant and Suspended Peerages With Genealogies and Arms (London, U.K.: Heraldry Today, 1972), page 210. Hereinafter cited as The New Extinct Peerage.
Margaret Segrave1
From 1836, her married name became O’Brien.1
- [S21] L. G. Pine, The New Extinct Peerage 1884-1971: Containing Extinct, Abeyant, Dormant and Suspended Peerages With Genealogies and Arms (London, U.K.: Heraldry Today, 1972), page 210. Hereinafter cited as The New Extinct Peerage.
Thomas Segrave1
Child of Thomas Segrave
- [S21] L. G. Pine, The New Extinct Peerage 1884-1971: Containing Extinct, Abeyant, Dormant and Suspended Peerages With Genealogies and Arms (London, U.K.: Heraldry Today, 1972), page 210. Hereinafter cited as The New Extinct Peerage.
