My husband is a descendant from George McLennan as well. George McLennan had 2 marriages, the first to Janet Frazer and they had sons George born 1835, William born 1837 died shortly after arriving in Canada in 1843, Alexander born 1842 and your John born1845. Janet died 1847. He then married Jane Glover and they had 10 children on being Andrew McLennan, my husbands great grandfather. Sometime around 1872 George McLennan and family moved to the Manitoulin Island and George McLennan died and is buried there.