Jacobus Johannus Ruijgrok, birth 7 Mar 1899 Rotterdam Ruijgrok, Jacobus Johannus 1899-
to:
Francina Sophia Rijnberg, birth 23 Mar 1898 Rotterdam, died 10 May 1963 Rotterdam, daughter of Willem Rijnberg and Melanie Elisabeth van de Velde Rijnberg, Francien 1898-1963
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1) Hubertus (Bertus) Ruijgrok, birth 1932, died 17 Nov 1977 Hoogerheide Ruijgrok, Hubertus 1932-1977
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