No, I do have record of Edgar Callis living in Toronto, in 1901. My father's side of the family has always spelled it Collis. No one questioned it. Margaret's handwriting of the name looked like an o not an a . I was don't remember meeting Her or anyone else of the Callis family.
Also, Margaret (Milligan) was married before Edgar. Walter Brown from New Brunswick, Canada. License issued in Boston, Ma.
The Margaret Milligan that married Walter Brown gives birth to children in April 1901 and April 1905 (both die shortly after birth) in Boston, Massachusetts, USA, do not think that is the same person.