Wolf van Creveld was the eldest son of Philip Jacob van Creveld and his brother Levie was the youngest in the family. Wolf was born in Rotterdam on 18 August 1911 and Levie there on 5 October 1921. According to the registration in the Population Registry of Rotterdam, Wolf was a seller at a cattletrader, but in later years was Wolf also active as an independent livestock dealer. His brother Levie …