Herman Kuijper was the youngest son of Hartog Mozes Kuijper and Elisabeth Gotlib, who had a family with twelve children and lived in Grave. Herman Kuijper was a vendor and has sold his merchandise among others for a short time in 1927 at the streetmarket at Dapperstaat in Amsterdam. He married 19 October 1921 in Amsterdam Bertha Meijer from Rotterdam, a daughter of Salomon Meijer and Henriette Coh…