Hartog Hakker and Johanna Frank married in 1911 in Amsterdam. They had three children, of whom one did not live at home anymore when the war broke out.
Stadsarchief Amsterdam, archiefkaart Hartog Hakker
In addition, a Jokos file (number 30573) on this household is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.