Eleanor Margaret Mortimer1 
From 1897, her married name became Trevelyan.
Children of Eleanor Margaret Mortimer and John Spencer Trevelyan
- John Thornton Trevelyan+2 b. 9 Mar 1898, d. 12 Aug 1970
- Roger de Thornton Trevelyan2 b. 3 Jun 1901, d. 1928
- Caroline Nora Constantia Trevelyan+2 b. 3 Jun 1902
John Thornton Trevelyan1 
Children of John Thornton Trevelyan and Anne Georgina Wardale
- Anne Margaret Thornton Trevelyan+2 b. 5 Feb 1930, d. 19 Apr 2016
- Joan Mary Thornton Trevelyan+2 b. 13 Feb 1932
- John Cecil Raleigh Trevelyan+2 b. 13 Jul 1933, d. 3 May 2003
- Edward Calverley Thornton Trevelyan+2 b. 26 Aug 1935
Professor John Dobson Wardale1
Child of Professor John Dobson Wardale
- Anne Georgina Wardale+2 d. 1989
Anne Georgina Wardale1 
From 19 June 1928, her married name became Trevelyan.
Children of Anne Georgina Wardale and John Thornton Trevelyan
- Anne Margaret Thornton Trevelyan+2 b. 5 Feb 1930, d. 19 Apr 2016
- Joan Mary Thornton Trevelyan+2 b. 13 Feb 1932
- John Cecil Raleigh Trevelyan+2 b. 13 Jul 1933, d. 3 May 2003
- Edward Calverley Thornton Trevelyan+2 b. 26 Aug 1935
John Cecil Raleigh Trevelyan1 
John Cecil Raleigh Trevelyan usually went by his middle name of Raleigh.1 He was educated at Marlborough College, Marlborough, Wiltshire, England.1 He held the office of High Sheriff of Northumberland in 1982.1 He lived in 2003 at Netherwitton Hall, Morpeth, Northumberland, England.1
Children of John Cecil Raleigh Trevelyan and Jane Peake
- Caroline Georgina Trevelyan2 b. 28 Nov 1962
- Tessa Margaret Thornton Trevelyan+2 b. 5 Apr 1966
- John Henry Thornton Trevelyan+2 b. 4 Oct 1968
William Augustus Peel1 
He was an inspector of the Local Government Board.1
Jane Peake1
From 25 January 1962, her married name became Trevelyan.
Children of Jane Peake and John Cecil Raleigh Trevelyan
- Caroline Georgina Trevelyan2 b. 28 Nov 1962
- Tessa Margaret Thornton Trevelyan+2 b. 5 Apr 1966
- John Henry Thornton Trevelyan+2 b. 4 Oct 1968
John Henry Thornton Trevelyan1
He was educated at Radley College, Abingdon, Oxfordshire, England.1 He graduated from Brunel University, Uxbridge, London, EnglandG, with a Bachelor of Science (B.Sc.) (Hons.)1 He was finance director of Octo Design Ltd between 1995 and 1999 at Newcastle-upon-Tyne, Northumberland, England.1 He was a designer and landowner.1 He lived in 2003 at Font House, Netherwitton, Northumberland, England.1
Children of John Henry Thornton Trevelyan and Anne-Marie Belinda Beaton
- James Francis Thornton Trevelyan2 b. 13 Jun 1999
- Emily Constance Thornton Trevelyan2 b. 16 Apr 2001
Donald Leonard Beaton1
Child of Donald Leonard Beaton and Katherine Bougarel
- Anne-Marie Belinda Beaton+2 b. 6 Apr 1969
Anne-Marie Belinda Beaton1
From 1 October 1998, her married name became Trevelyan. She held the office of Member of Parliament (M.P.) (Conservative) for Berwick upon Tweed on 7 May 2015. She held the office of Parliamentary Under-Secretary of State for Defence Procurement between 27 July 2019 and 16 December 2019. She held the office of Minister of State for the Armed Forces between 16 December 2019 and 13 February 2020. She held the office of Secretary of State for International Development between 13 February 2020 and 2 September 2020. She held the office of Minister of State for Business, Energy and Clean Growth on 8 January 2021.
Children of Anne-Marie Belinda Beaton and John Henry Thornton Trevelyan
- James Francis Thornton Trevelyan2 b. 13 Jun 1999
- Emily Constance Thornton Trevelyan2 b. 16 Apr 2001
