I think I can give a little more detail. John Arbuthnott Smith was my great grandfather, and I have the family bible in front of me with all the names and dates of birth.
John Arbuthnott Smith born 9 May (no year given)
Augusta Mary Isabel Griffin or Smith born 4 July (no year given) Married 19 February 1878
Chiuldren of above
John Arbuthnott Smith born 9 December 1878
Alfred Cecil Smith born 7 January 1880
Charles Owen Smith born 15 April 1881
Robert Arthur Smith born 11 November 1882 died Birchington, Kent 1968 approx
Harold Smith born 20 September 1885 killed in action 1916
Emma Caroline Smith born 6 January 1887 died in Worthing 1960s.
Frederick Augustus Smith born 29 October 1890
My grandfather always said that J.A. was bored to death clerking in Edinburgh and went to Ceylon initially to plant coffee (which was a failure) then tea (which was fine for a while) but after a crop failure took a job as Manager of the brewery in Nuwara Eliya, where he died and his grave is still well kept. I have a couple of sepia pictures of the family and the farm, with the children and servants all together (the Scots tea planters were not as standoffish towards the locals as the English civil servants down in Colombo).
After the death of their father, they were shipped to England where they lived with "Aunt Doll" who seems to have been a kindly soul, but how they came to be in Essex when their father was Sottish and their mother Welsh, I am not sure, although one of your answers gives a clue.
Harold was killed in the First World War, Emma never married but lived to a ripe old age and Robert ran away into the jungle and survived for a week at 7, ran away again and joined the army (underage) at 15, fought in the Boer War, and rose through the ranks to Colonel in the First World War (MC) and found life rather boring when not on active service. He died in the 1960s.
Going further back, the Dundee connection does not surprise me. On our side of the family, we all have signet rings with a Gaelic inscription "Caraid am Faim" and the family were supposed to be near Alyth in Perthshire in the 18th century.