Sepp was born may 10th 1923 to Rolf and Gretchen Reinard. He had an older brother Rolf Jr. Little is known about Sepp But he went from a small Czech village to Berlin for Hitler Youth when he was 11 and from there he went to Wehrmacht.His brother Rolf jr. was also sent to Hitler youth training but afterwards went on to the SS. Sepp lost contact with Rolf jr. after that for a while till he found out he was sent to the eastern front. Sepp attempted to go to the eastern front and got there. After meeting up with Rolf jr. in Poland he fought bravely alongside his brother and got promoted to orbergefreiter.