Jacob van de Kar was a son of Simon van de Kar and Esther de Groot. He married in Amsterdam on 26 January 1933 to Celine Rubens, daughter of Ruben Rubens and Abigael Rodrigues de Miranda. The couple had two daughters, of whom Elisabeth has survived the Holocaust by going into hiding in Deventer.
City Archive of Amsterdam, archive card of Jacob van de Kar and an addition of a visitor of the website…