Do you know where in England they came from?Where in Canada they settled?Do you know the names of any of William's siblings or any of William and Caroline's children?Were William and Caroline married in England or Canada? The more info you can post, the easier it will be to track them down.
I did find a death record for a son of William JACKSON and Caroline Francis RULE, Gordon Henry JACKSON b. 13-Nov-1909, d. 14-Nov-1910 in Cobalt, Nipissing, ON. Father's place of birth - Nottingham, England.