Relationship Chart:
Maria Kellner and Theodor Menken
Maria Kellner 
Birth 1 December 1865 -- Köln
Death 15 July 1944 (Age 78) -- Bonn
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Son
Theodor Menken 
Birth 16 February 1893 3427 -- Berlin
Death 12 February 1955 (Age 61) -- Köln-Riehl
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Theodor Menken is the son of Maria Kellner.