Klara Frankvoorder was a daughter of Hijman Frankvoorder and Marianne Peper. on 14 July 1886 she married Hartog Hammelburg in Amsterdam, a son of Nathan Salomon Hammelburg and Vogeltje Plukker. The couple had seven children, of whom the youngest daughter Sara died on 20 November 1900, only 8 months old. Also her husband Hartog Hammelburg passed already before the war: he died 26 Decenber 1930 in A…