In September 1941, an obituary was placed in Het Joodsche Weekblad for Betsy Vles-Warendorf.
Het Joodsche Weekblad, 12 September 1941, 11
Betsy Warendorf was a daughter of Mozes Warendorf and Duifje Samson.
Stadsarchief Amsterdam, archiefkaart Betsy Warendorf
Betsy Warendorf married in 1898 in Utrecht to mister Vles. Her husband survived the war.
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