- Born: 16 May 1890, Amersfoort, Utrecht, Nederland
- Marriage (1): Maria Helena de Haan on 9 May 1923 in Rotterdam, Zuid-Holland, Nederland
- Marriage (2): Gertruda Elisabeth Waschkau on 12 Feb 1919 in Rotterdam, Zuid-Holland, Nederland
- Died: 1945, Rotterdam, Nederland at age 55
Jan married Maria Helena de Haan, daughter of Aart de Haan and Maria Helena de Jong, on 9 May 1923 in Rotterdam, Zuid-Holland, Nederland. (Maria Helena de Haan was born about 1902 in Rotterdam, Zuid-Holland, Nederland.)
Jan next married Gertruda Elisabeth Waschkau, daughter of Friedrich Wilhelm Waschkau and Marie Beresnewitz, on 12 Feb 1919 in Rotterdam, Zuid-Holland, Nederland. (Gertruda Elisabeth Waschkau was born between 1892 and 1893 in Memel, (Pruisen).)
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