The coat of arms are probably those of Archibald the Grim, 3rd Earl of Douglas, though the stars are missing from above each of the hearts.
This would date it to the 14th century.
From a photograph by Jackie Stoddard
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?