Frits Jacobs was the son of Samuel Jacobs and Bella Reich. His mother died in 1936. Frits Jacobs married Rebecca Verveer in August 1942.
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On 26 February 1814 King William I decreed that the Nederlandsch Israëlitisch Seminarium (NIS) was to be established in Amsterdam to train rabbis, teachers and other officers serving the Jewish community.
Frits Jacobs, the son of Samuel, attended the NIS.