Eliazer van Geuns was a son of Hartog van Geuns and Kaatje van Biene. He was born in Rotterdam on 10 October 1890 but his parents came to Amsterdam already in 1893. He married 27 August 1919 in Amsterdam to Frederika Tas, who was born in the municipality of Nieuwer Amstel on 13 October 1894 as a daughter of Levie Tas and Clara Velt. The Van Geuns couple had two children: in 1921 Hartog was born an…