Oonagh Lavinia Baylay 
From 28 October 1944, her married name became Piercy.2 She held the office of Justice of the Peace (J.P.)2 After her marriage, Oonagh Lavinia Baylay was styled as Baroness Piercy on 7 July 1966.
Children of Oonagh Lavinia Baylay and Nicholas Pelham Piercy, 2nd Baron Piercy
- James William Piercy, 3rd Baron Piercy b. 19 Jan 1946
- Hon. Lavinia Carolione Piercy+ b. 24 May 1947
- Hon. Charlotte Mary Piercy+ b. 24 May 1947, d. 20 Nov 2018
- Hon. Henrietta Jane Piercy+ b. 17 Feb 1951
- Hon. Mark Edward Pelham Piercy+ b. 30 Jun 1953
- [S474] FamilySearch, online http://www.familysearch.com. Hereinafter cited as FamilySearch.
- [S37] BP2003 volume 3, page 3132. See link for full details for this source. Hereinafter cited as. [S37]
William Martineau1 
He was registered as a Member, Institute of Civil Engineers (M.I.C.E.)1
Child of William Martineau
- Edith Jane Martineau+1 b. 1866, d. 1950
- [S1007] Dr. G. Harry McLaughlin, “re: McLaughlin Family,” e-mail message to British and European Nobility Register, 25 January 2004 and 6 April 2004. Hereinafter cited as “re: McLaughlin Family.”
- [S9199] The Ancestry of HRH Catherine, online https://anthonyadolph.co.uk/princess-catherine/. Hereinafter cited as The Ancestry of HRH Catherine.
James William Piercy, 3rd Baron Piercy
He was educated at Shrewsbury School, Shrewsbury, Shropshire, EnglandG.1 He graduated from Edinburgh University, Edinburgh, Midlothian, ScotlandG, in 1968 with a Bachelor of Science (B.Sc.)1 He was appointed Associate Member, Institution of Electrical Engineers (A.M.I.E.E.)1 He succeeded as the 3rd Baron Piercy, of Burford, co. Oxford [U.K., 1945] on 22 March 1981.1 He was appointed Fellow, Chartered Association of Certified Accountants (F.C.C.A.)1 He lived at 36 Richford Street, London, England.1
- [S37] BP2003 volume 3, page 3132. See link for full details for this source. Hereinafter cited as. [S37]
Hon. Mark Edward Pelham Piercy
He was educated at Shrewsbury School, Shrewsbury, Shropshire, EnglandG.1 He was educated at New College, Oxford University, Oxford, Oxfordshire, EnglandG.1 He was admitted to Lincoln’s Inn entitled to practise as a barrister.1 He lived at 39 Carson Road, London, England.1
Children of Hon. Mark Edward Pelham Piercy and Vivian Angela Monier-Williams
- Katherine Henrietta Piercy b. 1 Aug 1982
- Olivia Charlotte Piercy b. 19 Aug 1984
- Harriet Lavinia Piercy b. 17 Jan 1987
- William Nicholas Pelham Piercy b. 11 Mar 1989
- [S37] BP2003 volume 3, page 3133. See link for full details for this source. Hereinafter cited as. [S37]
Hon. Charlotte Mary Piercy

She was educated at Badminton School, Westbury-on-Trym, Bristol, EnglandG.1 From 14 November 1966, her married name became Taddei.1 From 1985, her married name became Ropner.1 She lived at 1 Sunningdale Gardens, Straford Road, London, England.1 From 29 October 2018, her married name became Mansell-Jones.2
Children of Hon. Charlotte Mary Piercy and Paolo Emilio Taddei
- Caroline Rachel Taddei b. 7 Aug 1967
- Guido Taddei b. 4 Dec 1970
Child of Hon. Charlotte Mary Piercy and William Guy David Ropner
- Nicholas William Piercy Ropner3 b. 11 Nov 1986
Tommaso Piercy Tomba
- [S37] BP2003 volume 3, page 3133. See link for full details for this source. Hereinafter cited as. [S37]
Hon. Henrietta Jane Piercy
She was educated at Badminton School, Westbury-on-Trym, Bristol, EnglandG.1 She graduated from St. Andrew’s University, St. Andrews, Fife, ScotlandG, with a Master of Arts (M.A.)1 From 1985, her married name became Tomba.1 She lived at 69 Russell Road, Woking, Surrey, England.1
Children of Hon. Henrietta Jane Piercy and Tullio Luigi Giuseppe Tomba
- Tommaso Piercy Tomba b. 1987
- Francesco Piercy Tomba b. 1989
- [S37] BP2003 volume 3, page 3133. See link for full details for this source. Hereinafter cited as. [S37]
Hon. Penelope Katherine Piercy1 
She was educated at St. Paul’s Girls’ School, London, EnglandG.1 She was educated at Somerville College, Oxford University, Oxford, Oxfordshire, EnglandG.1 She was under-secretary to the Minister of Technology.1 She was appointed Commander, Order of the British Empire (C.B.E.) in 1968.1
- [S37] BP2003 volume 3, page 3132. See link for full details for this source. Hereinafter cited as. [S37]
Hon. Joanna Elizabeth Piercy 
She was educated at St. Paul’s Girls’ School, London, EnglandG.1 She was educated at Somerville College, Oxford University, Oxford, Oxfordshire, EnglandG.1 She was Headmistress at Badminton School, Westbury-on-Trym, Bristol, EnglandG.1 From 13 August 1968, her married name became Turner.1
- [S37] BP2003 volume 3, page 3132. See link for full details for this source. Hereinafter cited as. [S37]
Hon. Priscilla Jane Piercy1
She was educated at Downe House School, Cold Ash, Thatcham, Berkshire, EnglandG.1 She was educated at London School of Economics and Political Science, London, EnglandG.1 From 18 November 1950, her married name became Taylor.1
Children of Hon. Priscilla Jane Piercy and Reverend Thomas Fish Taylor
- Ann Clemency Taylor b. 7 Oct 1952
- Francis Nicholas Taylor b. 22 Jul 1954
- Helen Mary Taylor b. 27 Nov 1957
- Bridget Jane Taylor b. 5 Jun 1961
- [S37] BP2003 volume 3, page 3132. See link for full details for this source. Hereinafter cited as. [S37]