Hi. I am descended from your grandmother's brother Roderick Stewart. Was she married to Donald MacDonald? They had 11 children.
I would love to hear more about her and your branch of the family. I have been searching for years. I have lots of who married whom and their offspring.
Please let me know if you get this and we can share info. I am also in contact with a descendant of your Marion's oldest brother John Stewart.
Regards, Penny Mills, Ontario Canada