Lady Catherine Duff1 
From 11 August 1841, her married name became Ricardo. On 2 June 1857 she was granted the rank of an earl’s daughter.1
Child of Lady Catherine Duff and John Lewis Ricardo
- Algernon Lewis Ricardo2 d. c 1871
- [S37] BP2003 volume 1, page 1426. See link for full details for this source. Hereinafter cited as. [S37]
- [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.”
John Lewis Ricardo1 
He held the office of Justice of the Peace (J.P.)1 He held the office of Deputy Lieutenant (D.L.)1
Child of John Lewis Ricardo and Lady Catherine Duff
- Algernon Lewis Ricardo2 d. c 1871
- [S37] BP2003 volume 1, page 1426. See link for full details for this source. Hereinafter cited as. [S37]
- [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.”
Algernon Lewis Ricardo1 
- [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.”
Lady Jane Duff1 
From 25 October 1753, her married name became Urquhart.
Children of Lady Jane Duff and Keith Urquhart of Meldrum
- Lewis Urquhart2 d. c 1790
- Jane Urquhart2
- Mary Urquhart2
- James Urquhart of Meldrum2 b. 8 Dec 1754, d. 1835
- [S37] BP2003 volume 1, page 1426. See link for full details for this source. Hereinafter cited as. [S37]
- [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.”
Keith Urquhart of Meldrum1 
He lived at Bethelnie, ScotlandG.3 He held the office of Sheriff of Banffshire.1
Children of Keith Urquhart of Meldrum and Lady Jane Duff
- Lewis Urquhart3 d. c 1790
- Jane Urquhart3
- Mary Urquhart3
- James Urquhart of Meldrum3 b. 8 Dec 1754, d. 1835
- [S37] BP2003 volume 1, page 1426. See link for full details for this source. Hereinafter cited as. [S37]
- [S3508] S. Thomson, “email: Kirwan Family,” e-mail message to BENR, 16 January 2009 – 12 February 2010. Hereinafter cited as “email: Kirwan Family.”
- [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.”
James Urquhart of Meldrum1 
- [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.”
- [S37] BP2003 volume 3, page 3972. See link for full details for this source. Hereinafter cited as. [S37]
Lewis Urquhart1 
- [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.”
Jane Urquhart1
- [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.”
Mary Urquhart1
- [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.”
Hon. George Duff1 
Children of Hon. George Duff and Frances Dalzell
- James Duff2 b. 1758, d. 29 Mar 1832
- George Duff3 b. 1760, d. 1828
- Jane Duff2 b. 1765, d. 1792
- Frances Duff2 b. 26 Jun 1766, d. 6 Mar 1787
- [S37] BP2003 volume 1, page 1426. See link for full details for this source. Hereinafter cited as. [S37]
- [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.”
- [S37] BP2003. [S37]
