Louise Charlotte Warendorf was born 7 September 1904 in the parental home at Tolsingel in Utrecht as daughter of the paper manufacturer Louis Warendorf and Charlotte Elias. According her daughter Wera, she was a soft and artful woman and she had attended a conservatory course as concert pianist.
At the age of 18 she married 19 September 1922 in Utrecht the medical doctor Willem Gerard de Haas, bor…