Tilly Spier married Jack Zwartverwer on 12 March 1942 in Amsterdam. She was a sister of Rachel Spier.
Stadsarchief Amsterdam, archiefkaart Tilly Spier
This person is commemorated on a memorial in Vierhouten. More information on this memorial can be found (in Dutch) on the website of the Nationaal Comité 4 en 5 mei.