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Mary McLachlan was born 1869 in Greenock, Scotland. She is the daughter of Robert Douglas McLachlan (1834-?) and Jane Stewart. Her siblings were Jane Stewart McLachlan (1878-?), Colin McLachlan (1863-?), John McLachlan (1867-?), Elizabeth McLachlan (1873-?), Robert McLachlan (1874-?), James McLachlan (1877-?).