Gerrit Veffer and Elisabeth Roos married on 14 August 1940 in Amsterdam. They had a child in 1943 that survived the war.
Stadsarchief Amsterdam, archiefkaart Gerrit Veffer
In addition, a Jokos file (number 16936) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.