Sara Polak was a daughter of Moses Polak and Lea Benima. She married Frederik Benima in 1910 in Amsterdam. He passed away in 1923. She married Salomon Swarts in 1926 in Amsterdam.
Stadsarchief Amsterdam, archiefkaart Sara Polak
In addition, a Jokos file (number 52137) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.