Sijbilla van Dijk was a daughhter of Manus van Dijk, bookkeeper and Mientjen Katz. She married in Doesburg Mozes Katz on 9 April 1910, a son of Benjamin Katz and Sijbilla Philipson.
website www.wiewaswie.nl
This person is commemorated on a memorial in Doesburg. More information on this memorial can be found (in Dutch) on the website of the Nationaal Comité 4 en 5 mei.