Johanna Dekker was a daughter of Levie Abraham Dekker and Rebecca van Vliet. She married two times: on 15 March 1916, she married in Amsterdam Mietje Tierlier's widower Wolf Bles, a son of Simon Wolf Bles and Sara Gabriel Gazan. However after two years Wolf Bles passed away, 61 years old and he was interred in the Jewish Cemetery of Diemen. Johanna married the 2rd time to the widower of Esther Morpurgo, Sander Sanders on 12 June 1919 in Zaandam, a son of Boas Sanders and Sara Mendels. This marriage however did not last and ended in a divorce in Zaandam on 31 March 1921.
Johanna Dekker was born into a family with seven children. Her brother Elias died in 1929 but her brothers Abraham, Salomon (called Leo) and Jacob survived the Holocaust. Her sisters Jansje and Emma were killed in the Shoah. Johanna lived in Amsterdam at Plantage Parklaan and spent many times with her unmarried sister Jansje, who lived around the corner at Plantage Doklaan.
Together with her sister Jansje, Johanna was registered in Camp Westerbork on 4 February 1943 and deported on 9 February to Auschwitz, where they have been killed both on 12 February 1943 immediately upon arrival there.
City Archive of Amsterdam, archive cards of Johanna Dekker and Jansje Dekker; website www.wiewaswie.nl and the file cabinet of the Jewish Council of Amsterdam, cards of Johanna and Jansje Dekker.