Julian Blackett Thornton Trevelyan1
Child of Julian Blackett Thornton Trevelyan and Helen Bevan
- Elliot Charles Thomas Thornton Trevelyan3 b. 4 Jul 2007
Helen Bevan1
From 14 October 1995, her married name became Trevelyan.
Child of Helen Bevan and Julian Blackett Thornton Trevelyan
- Elliot Charles Thomas Thornton Trevelyan3 b. 4 Jul 2007
Hugh Robert Thornton Trevelyan1 
Children of Hugh Robert Thornton Trevelyan and Laura Walker
- Joshua Robert Byrne Trevelyan3 b. 31 Jul 2013
- William Laurence Thornton Trevelyan3 b. 18 Feb 2016
Rosemary Joy Trevelyan1
Amanda Fay Trevelyan1
Anne Margaret Thornton Trevelyan1 
From 29 August 1953, her married name became Usborne.
Children of Anne Margaret Thornton Trevelyan and John Humphrey Usborne
- Richard Thomas Usborne+2 b. 18 Jul 1954
- John Edward Usborne+2 b. 18 Jul 1954
- Andrew Thornton Usborne+2 b. 16 Sep 1956
Lt.-Col. John Usborne1
He lived at Writtle, Essex, England.1
Children of Lt.-Col. John Usborne and Rose Elise Mildred Winch
- John Humphrey Usborne+3 d. 29 Apr 1999
- Josephine Brooke Usborne+2 b. 28 May 1914, d. 1974
- [S37] BP2003 volume 3, page 3932. See link for full details for this source. Hereinafter cited as. [S37]
- [S5792] Robin Dening, “re: Rochfort Family,” family provided evidence then verified by subsequent research and verification by BENR (101053), 2 January 2012. Hereinafter cited as “re: Rochfort Family.”
- [S37] BP2003. [S37]
John Humphrey Usborne1 
Children of John Humphrey Usborne and Anne Margaret Thornton Trevelyan
- Richard Thomas Usborne+2 b. 18 Jul 1954
- John Edward Usborne+2 b. 18 Jul 1954
- Andrew Thornton Usborne+2 b. 16 Sep 1956
- [S37] BP2003 volume 3, page 3932. See link for full details for this source. Hereinafter cited as. [S37]
- [S37] BP2003. [S37]
- [S5792] Robin Dening, “re: Rochfort Family,” family provided evidence then verified by subsequent research and verification by BENR (101053), 2 January 2012. Hereinafter cited as “re: Rochfort Family.”
Richard Thomas Usborne1
He was educated at Malvern College, Malvern, Worcestershire, England.1
Children of Richard Thomas Usborne and Henrietta E. M. White-Spunner
- Thomas Masters Usborne2 b. 1983
- Alice Usborne2 b. 1985