Lady Mary Augusta Pierrepont1 
From 4 April 1899, her married name became Grant.1
Children of Lady Mary Augusta Pierrepont and John Peter Grant, 13th of Rothiemurchus
- Gregor James Grant+ b. 11 Apr 1902, d. 13 Jun 1998
- Jean Cecely Mary Grant+2 b. 2 May 1909
- [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 190. Hereinafter cited as The New Extinct Peerage.
- [S1438] Sir William, Bt. Arbuthnot, “re: Arbuthnot and Duff Families,” e-mail message to British and European Nobility Register, 29 August 2005 and later. Hereinafter cited as “re: Arbuthnot and Duff Families.”
Helen Shaw-Stewart1 
From 28 September 1880, her married name became Pierrepont.1
Children of Helen Shaw-Stewart and Charles William Sydney Pierrepont, 4th Earl Manvers
- Lady Cicely Mary Pierrepont1 b. 4 Nov 1886, d. 24 Oct 1936
- Evelyn Robert Pierrepont, 5th Earl Manvers1 b. 25 Jul 1888, d. 6 Apr 1940
- Alice Helen Pierrepont1 b. 30 Aug 1889
- Lady Sibell Pierrepont1 b. 19 May 1892
- [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 190. Hereinafter cited as The New Extinct Peerage.
- [S37] BP2003 volume 3, page 3591. See link for full details for this source. Hereinafter cited as. [S37]
Evelyn Robert Pierrepont, 5th Earl Manvers1 
He succeeded as the 5th Baron Newark of Newark-on-Trent, co. Nottingham [G.B., 1796] on 17 July 1926.1 He succeeded as the 5th Earl Manvers [U.K., 1806] on 17 July 1926.1 He succeeded as the 5th Viscount Pierrepont of Holme Pierrepont, co. Nottingham [G.B., 1796] on 17 July 1926.1
- [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 190. Hereinafter cited as The New Extinct Peerage.
Lady Cicely Mary Pierrepont1 
From 6 October 1915, her married name became Hardy.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 190. Hereinafter cited as The New Extinct Peerage.
Lt.-Col. Francis Henry Hardy1
- [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 190. Hereinafter cited as The New Extinct Peerage.
Alice Helen Pierrepont1 
- [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 190. Hereinafter cited as The New Extinct Peerage.
Lady Sibell Pierrepont1 
From 10 April 1923, her married name became Argles.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 190. Hereinafter cited as The New Extinct Peerage.
H. D. Argles1
- [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 190. Hereinafter cited as The New Extinct Peerage.
Marie-Louise Roosevelt Butterfield1 
From 5 February 1918, her married name became Pierrepont.1
Children of Marie-Louise Roosevelt Butterfield and Gervas Evelyn Pierrepont, 6th Earl Manvers
- Lady Mary Helen Venetia Pierrepont1 b. 22 May 1920, d. 21 Feb 1930
- Hon. Evelyn Louis Butterfield Pierrepont1 b. 8 May 1924, d. 29 Sep 1928
- Lady Frederica Rozelle Ridgway Pierrepont1 b. 17 Nov 1925, d. 22 Jun 2015
- [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 190. Hereinafter cited as The New Extinct Peerage.
- [S68] H. Pirie-Gordon, editor, Burke’s Genealogical and Heraldic History of the Landed Gentry, 15th edition, (London, England: Burke’s Peerage Ltd, 1937), page 303. Hereinafter cited as Burke’s Landed Gentry, 15th ed.
- [S466] Notices, The Telegraph, London, UK. Hereinafter cited as The Telegraph.
Sir Frederick William Louis Butterfield1 
He graduated from New York, U.S.A.G, in 1882 with a Bachelor of Laws (LL.B.)2 He graduated from Leipzig Conservatoire of Music, Leipzig, Brandenburg, GermanyG, with a Master of Music.2 He was U.S. Consul at Ghent between 1888 and 1890.2 He graduated from Balliol College, Oxford University, Oxford, Oxfordshire, EnglandG, in 1900 with a Master of Arts (M.A.)2 He held the office of Justice of the Peace (J.P.) for the West Riding, Yorkshire.2 He held the office of Mayor of Keighley between 1916 and 1918.2 He was appointed Knight Bachelor in 1922.2 He lived at Cliffe Castle, Keighley, Yorkshire, West Riding, EnglandG.2
Child of Sir Frederick William Louis Butterfield and Jessie Kennedy Ridgway
- Marie-Louise Roosevelt Butterfield+1 d. 1984
- [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 190. Hereinafter cited as The New Extinct Peerage.
- [S68] H. Pirie-Gordon, editor, Burke’s Genealogical and Heraldic History of the Landed Gentry, 15th edition, (London, England: Burke’s Peerage Ltd, 1937), page 303. Hereinafter cited as Burke’s Landed Gentry, 15th ed.