Willem Knap was the youngest of three children of Simon Knap and Hendrika Wolffers. At the time that he was registered at the Jewish Council of Amsterdam, he was listed as "unmarried". However, Willem is still in the summer of 1942, before he was deported to Auschwitz married in Rotterdam to Grietje…
In addition, a Jokos file (number 51900) on this household is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.