Addition

Joseph Dwinger and his family

Joseph Dwinger and Kaatje Cohen had four children. On 26 April 1904 their son Simon was born. Simon Dwinger didn't survive the war, the other three children did.
Addition of a visitor of the website

Joseph Dwinger had a photography shop on the Grachtswal in Leeuwarden. He was known throughout Friesland as a school photographer. He was married to Kaatje Dwinger-Cohen.
S. de Jong, Joods leven in de Friese hoofdstad 1920-1945. Voltooid verleden tijd (Leeuwarden, 1970) 111-112

In addition, a Jokos file (number 34307) on this family is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.