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In page Erich Hoepner:

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Under the Nazi practice of Sippenhaft (collective punishment) Hoepner's wife, daughter, son (a major in the army), brother and sister were arrested.[6] The women were sent to Ravensbrück concentration camp. His sister was soon released but Frau Hoepner and her daughter were placed in the notorious Strafblock for four weeks' additional punishment.[7][8] Hoepner's son was first held at a specially created camp at Küstrin (now Kostrzyn nad Odrą) and then sent to Buchenwald concentration camp.[9]