There must have been some old parents in your line! Janet Douglas is my 15th great grandmother. That makes her one of my 32,678 15th great grandparents.
I was just at Glamis Castle this past weekend but didn't at the time realize Janet was in my family. I knew from the "Find Famous Relatives" feature that I was(very) distantly related to Queen Elizabeth II. Fun to dig in and see the Douglas/Lyon connection.