+———James GERVIN (1811/2 County Tyrone, Ireland – 27 Nov 1875 Ottawa, Ontario, Canada)          |      +———Joseph GERVIN (abt 1862 Ottawa, Ontario, Canada – 1953)      |   |              |   |   +———William WHITEHEAD (abt 1797 Kent, England – 8 Aug 1844 Ottawa, Ontario, Canada)      |   |   |      |   +———Elizabeth WHITEHEAD (17 Mar 1824 St. Marylebone, Middlesex, England – 15 Mar 1911 Ottawa, Ontario, Canada)      |       |          |       +———Mary Jane PARKER (abt 1805 Waterford, Ireland – 6 Jun 1888 Ottawa, Ontario, Canada)      |  +———James Douglas “Douglas” GERVIN (1894 Quebec, Canada – )  |   |      |   +———Elizabeth SMITH (1868 Buckingham, Quebec, Canada – 1946)  |      Verna GERVIN (abt 1919 Ontario, Canada – )  |          |   +———George DAVIDSON  |   |  +———Edna Verna DAVIDSON (1896 Quebec, Canada – )      |          +———Mary Ann MILFORD