This seems to be a few years after the above messages!However, if anyone is reading, I have researched for a friend, Colleen Collum, and found the following:
Colleen Collum, daughter of, William Henry Collum, 1907, Dauphin, Manitoba, son of William Henry Collum, Blacksmith, 1872, Ontario, son of Zacharias Collum, Blacksmith, 1846, Ontario, son of Turpin Calham, born 1804, England, a son of Reverend John Calham, Turpin married Letitia or Lucretia and had at least four children:
1John Culham, 1837, married Christina Watson 2Turpin Culham, Jr, married Emma Beston, moved to Kansas 3James Culham, married Jane Taylor. 4Zacharias Collum, born 1846, married Mary Ann Flemming and had at least three sons:
1 William Henry Collum (mentioned above) 2 Joneman Howard Collum 3 David Collum
I have no information on Joneman, but it seems that David Collum went with his older brother William Henry to Manitoba and is found living with his family in the 1911 Census for Dauphin, Manitoba. Descendants from this branch are scattered throughout western Canada as far west as Vancouver, BC, and vicinity.
Hope this adds something to your search and I would be interested in finding the other children of Reverend John Culham and Ann Turpin