"Hi my great grandfather Rev James Struthers Douglas was a Presbyterian minister serving in St Andrews Church Peterborough Ontario in 1856, several of his children were born there, not sure if any of them stayed on after he returned to UK 1864.…"
The more information you can give about the people you mention, the more chance there is of someone else connecting with your family.
Dates and places of births, deaths and marriages all help to place families.
Professions also help.
'My great-grandmother mother was a Douglas from Montrose' does not give many clues to follow up! But a bit of flesh on the bones makes further research possible. But if we are told who she married, what his profession was and where the children were baptised, then we can get to work.
Maybe it is time to update the information in your profile?