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Sorry, Helen, I don't as yet know with any certainty where in Ireland Mary Purveyance and Charles Gordon came from. I have been in touch with Tony Gordon in Australia, a descendent of the David Gordon you mentioned, re Gordons and Purvines there. He has much fascinating material on family history. I feel much was lost with the untimely cholera death of Charles--Mary would have been left with 4 children the oldest being my g-grandfather, Joseph, and a new farm. There may have been other "hidden" people in this scenario. Mary is believed to have been married to a Buchanan who died leaving her with some Buchanan child(ren). I am aware of an 'Uncle' Sam Buchanan who worked for the Grand Trunk railroad and ended up in Truro, Nova Scotia.
The oral history I have seems not to mesh. The descendents of Charles and Mary's daughter Matilda (Gordon) Robinson say 'we were from Tullywhiskers', obviously a childs rendering of Tullyniskan, but this could have been the Robinson side. They also state that the family sailed from Derry in 1858 when Matilda was 9 yrs. old. I have been in touch with descendents of Charles and Mary's daughter Mary (Gordon) Pennock who believe that Charles and Mary were at some time in Belfast.
The dates and first name lineage (Matilda, Joseph, etc)and religion fit with the Donegal/Tyrone family, but no proof. I'm new to this by a couple of months--perhaps I can turn up something when I can actually get to the records in Innisfil or Barrie.