Relationship Chart:
Maria Kellner and Otto Menken
Maria Kellner 
Birth 1 December 1865 -- Köln
Death 15 July 1944 (Age 78) -- Bonn
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Son
Otto Menken 
Birth 26 January 1900 4134 -- Berlin
Death 9 September 1944 (Age 44) -- Metz
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Otto Menken is the son of Maria Kellner.