Grietje Blitz was born on 12 February 1902 in Amsterdam as daughter of Salomon Blitz and Anna van Praag. She lived at home with her parents and her famous sister and concert singer Esther (Elly) Blitz at Biesboschstraat 18 parterre in Amsterdam-South, till she got married on 13 March 1929 with Hartog Italiaander, born 13 May 1905 in Amsterdam as son of Mozes Italiaander and Judith Corper. After th…