Trevor,
The second son was named Morton James born 1882/1883 not sure where, waiting for details of John Glen Aitken(s) born 1881.
I have just found a 1881 census for Mary Jane Atkins a soldiers wife, in Aldershot , have not found John on the 1881 census. Most of what I have found for John is under the name Aitken, he was a Sailmaker from Aberdeenshire.
Thanks for the help, Joan