Leonora Thayne Railton1 
From 26 February 1952, her married name became O’Brien. She lived at 49 Kenway Road, London, EnglandG.1
Children of Leonora Thayne Railton and Edward Donough O’Brien
- Fionn Murrough Manning O’Brien+2 b. 14 Mar 1953
- Lucius Edward O’Brien+2 b. 1 Apr 1957
- [S37] BP2003 volume 2, page 2039. See link for full details for this source. Hereinafter cited as. [S37]
- [S37] BP2003. [S37]
- [S7862] David Armstrong, “re: Cadogan Family,” family provided evidence then verified by subsequent research and verification by BENR (101053), 9 January 2016. Hereinafter cited as “re: Cadogan Family.”
Fionn Murrough Manning O’Brien1
He was educated at Stowe School, Buckingham, Buckinghamshire, England.1 He was regional Director of Newsweek International Amsterdam.1 He lived in 2003 at Calle de Arzobispo, Madrid, SpainG.1
Child of Fionn Murrough Manning O’Brien and Carole Ann Whitlock
- Zoe O’Brien2 b. 1973
Children of Fionn Murrough Manning O’Brien and Monica van der Eb Jacobus
- Murrough Marinus Edward O’Brien2 b. 16 Feb 1997
- Annalette Leonora Stella O’Brien2 b. 8 Mar 1999
Carole Ann Whitlock1
From 1973, her married name became O’Brien.
Child of Carole Ann Whitlock and Fionn Murrough Manning O’Brien
- Zoe O’Brien2 b. 1973
Zoe O’Brien1
Lt.-Cdr. Marinus Jacobus1
Child of Lt.-Cdr. Marinus Jacobus
Monica van der Eb Jacobus1
From 1996, her married name became O’Brien.
Children of Monica van der Eb Jacobus and Fionn Murrough Manning O’Brien
- Murrough Marinus Edward O’Brien2 b. 16 Feb 1997
- Annalette Leonora Stella O’Brien2 b. 8 Mar 1999
Murrough Marinus Edward O’Brien1
Annalette Leonora Stella O’Brien1
Lucius Edward O’Brien1
He was educated in 1967 at Stowe School, Buckingham, Buckinghamshire, England.1 He gained the rank of Lieutenant in the Irish Guards.1 He was a money broker.1 He lived in 2003 at 22 Hendrick Avenue, London, EnglandG.1
Children of Lucius Edward O’Brien and Caroline Veronica Mary Phillips
- Caroline Louisa Maire O’Brien2 b. 1992
- Olivia Alison Clare O’Brien2 b. 1993