Hi, I am a descendant of this Duff family.
My dad's mother was Jessie Duff, the daughter of Andrew Duff, who came to Canada in 1881.
My father didn't even know that his grandfather Andrew Duff had any relatives here in Canada until I went on ancestry.ca.
Just a wee correction on some info a previous reply gave you: Alice Duff married Arthur Reginald Piper.
My sister's middle name is Duff, and she was thrilled to find out there are lots of Duffs in Ontario we are related to.