Here, from the English website of Der Spiegel, is an article that discusses the adoption of multiracial children born to German women  in the years after World War II.  The Difficult Identities of Postwar Black Children of GIs by Stephanie Siek tells the stories of a number of these children, now grown, and describes several organizations formed in recent years that have helped them to uncover their histories.  A sidebar notes a book by a U.S. historian,  Heide Fehrenbach called Race After Hitler: Black Occupation Children in Postwar Germany and America (2005).