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