"In this city on the 30th ultimo, Mr. William Rutherford, to Elizabeth, eldest daughter of Mr. Thomas Jackson, all of Montreal." (June 2, 1856, p. 2).
This is great! Now I can confirm that the Thomas Jackson at Elizabeth and William's wedding was indeed her father and not a brother or cousin. It also appears that Elizabeth had younger siblings, probably sisters. Her mother is not mentioned, but knowing the name of her father will definitely help find her birth family. I wonder if he was in the construction trade?