Sara Betsy Wijnbergen-Slager, also known as Sonja, was the daughter of Jaap Slager and Rozette van Gelder. Before her marriage she had worked as a saleswoman in a clothing shop. Sonja and Leo Wijnbergen did not have any children.
Addition of a visitor of the website.
Volgens het Zwolse bevolkingsregister trouwde Sara Betsij op 13 okt. 1932 te Zwolle met Leo Wijnbergen, vertegenwoordiger. Op dezelfde dag vertrok Sara vanuit Zwolle naar Rotterdam.
In addition, a Jokos file (number 15474) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.