Keetje Wurms was a daughter of Mozes Wurms and Eva Visser. Her mother died in 1933 but since father divorced his 2nd wife in 1939, Keetje lived in the family of Hijman Vleesdrager en Anna Wurms. Anna was a sister of her father Mozes.
City Archive of Amsterdam, archive cards of Mozes Wurms and Keetje Wurms.