Gertrud Franzisca Cohn was a daughter of Werner Cohn and Thekla Levisohn. She married om 3 February1920 in Amsterdam to Jacques van Tijn, son of David Arie van Tijn and henriette Rosendaal. She divorced in 1937. She had two children.
Stadsarchief Amsterdam, archiefkaart Gertrud Francisca Cohn and website www.wiewaswie.nl.
In addition, a Jokos file (number 61559) on this person is at the Amsterdam…