I have found a marriage record for John Fortune and Janet Leitch in Paisley, Scotland. Married 5 December 1823. They are the parents of Andrew Fortune, born in Paisley 28 April 1831. Andrew Fortune married Esther Shaw Carr (born in Ireland in 1838) in Huntingdon, Quebec, Canada on 30 May 1853. His father John Fortune witnessed the baptisms of several of their children in 1862 in Huntingdon, as did his brother William Fortune. I would be very interested in learning anything more you may know about this family!