Naatje van Thijn, Jacob and Frederika's eldest daughter, lived and worked at the Jewish Boys' Orphanage in Amsterdam.
Record card, Amsterdam City Archive
In addition, a Jokos file (number 13900) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.
According to a list with shops of Jewish owners, compiled by the Amsterdam police in 1940, this family had a butcher shop, address: Tweede Goudsbloemdwarsstraat 23 in Amsterdam.
Abstracts of the police archives which are currently at the Amsterdam municipal archives