Kostrzyn nad Odrą
Under the Nazi practice of "Sippenhaft" (collective punishment) Hoepner's wife, daughter, son (a major in the army), brother and sister were arrested. 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. Hoepner's son was first held at a specially created camp at Küstrin (now Kostrzyn nad Odrą) and then sent to Buchenwald concentration camp.