Hi Lee
I have a date for Roberts son George of 1828. He married a Janet Cairns in 8 July 1851 in St Cuthberts, Edinburgh, Midlothian. His father was Robert Aitken, married to Isabella Borthwick. Unfortunately I do not have dates for them but I would imagine looking in the 30 year period.
George and Janet traveled out to Brisbane, Australia on the William and Mary in 1852, which is where I pick up my great grandfathers family.
Thanks for being willing to look
Sharleen