Susanna B. Norrish is my first cousin (twice removed). You are correct in that she and Frank had three children, but I am sorry to say that the most informed relative I could have asked about the Banfield children died last Monday in Guelph at 103.
I have no data on Francis Morley Banfield, but I do know that his two sisters were buried in Woodlawn Cemetery in Guelph, Ontario. I visited their graves about 4 years ago.
I will ask another older cousin about Morley and get back to you. You may read about the Norrishes in this genealogical newspaper article from a few years ago. There is a photo of Susanna Norrish Banfield and her sibs. http://news.halinet.on.ca/106999/page/12?n=http://news.halinet.on.ca/106999/page/12?n= Sincerely, Dr. U. Kennedy New York City