The rest of the Grünberg family stayed for some time in the Petermann house in Untersekerschan but, after World War II, all people living in Pilsen who spoke German were made to leave the country by the Czech government. This was called the Beneš decrees. He moved with his mother (who died in 2002 aged 74) and sister to Lauterbach, Hesse. He studied at a gymnasium (second level school) there.