Relationship Chart:
Leo Menken and Ernst Menken
Leo Menken 
Birth 23 July 1889 34 30 -- Amsterdam
Death 1959 (Age 69) -- Nizza
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Father
Leo Menken
Birth 24 August 1854 4128
Death 7 November 1917 (Age 63) -- Köln
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Brother
Ernst Menken
Birth 3 September 1860 4734 -- Köln
Death 10 April 1914 (Age 53) -- Koblenz-Pfaffendorf
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Ernst Menken is the uncle of Leo Menken.