Eva van Zwanenburg married Isaak van Gelderen in 1899 in Rotterdam. He passed away in 1934. Besides the here mentioned daughter they also had a son Karel Nathan.
Stadsarchief Amsterdam, archiefkaart Eva van Zwanenburg
In addition, Jokos files (numbers 14266, 32318) on this family or other family members are at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.