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Klaus Detlef Sierck was a German child actor. He was the son of the theatre and film director Hans Detlef Sierck (better-known today as Hollywood director Douglas Sirk) and the theatre actress Lydia Brincken. After his parents separated in 1928, Sierck grew up with his mother and was distanced from his father during the Nazi period after the latter married actress Hilde Jary, who was Jewish. Wikipedia