Jetje van Collem was a daughter of David van Collem and Rachel Olivier. She married 26 August 1931 in Amsterdam Barend Borstel, a son of Isaac Borstel and Rebekka Elkan Reimer. Barend was previously married to Jetje's sister Leentje van Collem, who passed away already on 20 May 1930 and was interred…
In addition, a Jokos file (number 1694) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.