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William Swan McWhirter was born 14 May 1862 in Lackawannock Township. He was the sixth child of John McWhirter and his third wife Mary Jane Garvin.
He married Margaret Hassel on 24 Feb 1891. They were the parents of 13 children, one of which was Mary Elizabeth McWhirter Forrester.
William Swan McWhirter died 24 Nov 1941.