Alexander Wellesley Grant Leith-Buchanan1 
He gained the rank of Lieutenant in the 9th Battalion, Argyll and Sutherland Highlanders.1
George Hector Leith-Buchanan1 
He was awarded the Military Cross (M.C.)1 He fought in the First World War, he was mentioned in despatches.1 He gained the rank of Lieutenant in the Machine Gun Corps.1
Isadore McWilliam Bourke1
Child of Isadore McWilliam Bourke
- Mathilda Mary Charlotte Bourke2 d. 8 Feb 1908
Mathilda Mary Charlotte Bourke1 
From 22 September 1904, her married name became Leith-Buchanan.
James Macdonald Buchanan Leith-Buchanan1 
He gained the rank of Captain in the Territorial Forces Reserve.1 He fought in the Boer War between 1901 and 1902.1 He was with the recruiting staff between 1916 and 1919.1
Children of James Macdonald Buchanan Leith-Buchanan and Katie Isabel Porter
- John Wellesley Macdonald Leith-Buchanan+2 b. 22 May 1908, d. 1956
- Jean Isobel Barbara Leith-Buchanan2 b. 18 Apr 1911
- David Gustavus James Leith-Buchanan2 b. 25 Sep 1916, d. 24 Feb 1941
George E. Porter1
Child of George E. Porter
- Katie Isabel Porter+2 d. 16 Dec 1943
Katie Isabel Porter1 
From 23 August 1905, her married name became Leith-Buchanan.
Children of Katie Isabel Porter and James Macdonald Buchanan Leith-Buchanan
- John Wellesley Macdonald Leith-Buchanan+2 b. 22 May 1908, d. 1956
- Jean Isobel Barbara Leith-Buchanan2 b. 18 Apr 1911
- David Gustavus James Leith-Buchanan2 b. 25 Sep 1916, d. 24 Feb 1941
John Wellesley Macdonald Leith-Buchanan1 
He gained the rank of Able Seaman in the Royal Navy Volunteer Reserve.1 He fought in the Second World War.1
Child of John Wellesley Macdonald Leith-Buchanan and Jane Elizabeth Macdonald McNicol
- Sir Charles Alexander James Leith-Buchanan, 7th Bt.+2 b. 1 Sep 1939, d. 1998
Ronald McNicol1
Child of Ronald McNicol
- Jane Elizabeth Macdonald McNicol+2 d. 1955
Jane Elizabeth Macdonald McNicol1 
From 26 June 1939, her married name became Leith-Buchanan.
Child of Jane Elizabeth Macdonald McNicol and John Wellesley Macdonald Leith-Buchanan
- Sir Charles Alexander James Leith-Buchanan, 7th Bt.+2 b. 1 Sep 1939, d. 1998