Josua Polak was a son of Barend Josua Polak and Saartje Cohen. He married Johanna Maarssen in 1921 in Rotterdam.
Addition of a visitor of the website
In addition, a Jokos file (number 3578) on this household is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.