This is a new experience for me but I understand that there are no Idenden families in Canada except myself and one sibling. Our grandfather Stephen Idenden was born 1880's in Kent England and he immigrated to Canada some time prior to WW1. Stephen had one brother in USA but he had no sons. My father was an only child and my brothers only son is at present non married. If Mark has no male issue that is the end of the Idenden name in North America as far as we know.
Daphne Tonellato (Idenden)