Jetje van Esso was a daughter of Hartog van Esso and Vrouwtje Joles. She married Herman Polak in 1903 in Amsterdam. He passed away in 1935. They had at least one child that survived the war.
Stadsarchief Amsterdam, archiefkaart Jetje van Esso
In addition, a Jokos file (number 3299) on this household is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.