Montagu Cholmeley Johnstone1 
Peirce de Lacy Henry Johnstone1 
He was a practising barrister.1 He graduated from Oxford University, Oxford, Oxfordshire, England, with a Master of Arts (M.A.)1
Jessie Sime1
From 24 October 1888, her married name became Johnstone.
Alice Jane Johnstone1 
From 17 December 1901, her married name became O’Mahony.
Peirce O’Mahony1
He lived at Grange Con, County Wicklow, Ireland.1
- [S37] BP2003 volume 2, page 2111. See link for full details for this source. Hereinafter cited as. [S37]
Edith Lucy Maria Johnstone1
From 12 December 1888, her married name became Barnard.
Leonard Girtin Pierrepont Barnard1
He lived at Upper Norwood, London, England.1
- [S37] BP2003 volume 2, page 2111. See link for full details for this source. Hereinafter cited as. [S37]
Caroline Elizabeth Johnstone1 
From 23 June 1829, her married name became Gray.
Child of Caroline Elizabeth Johnstone and Reverend John Hamilton Gray of Carntyne
- Caroline Maria Agnes Robina Gray+ d. 12 Feb 1882
unknown daughter Gray1
- [S47] BIFR1976 page 489. See link for full details for this source. Hereinafter cited as. [S47]