Koos and Rika, both children of Benedictus Bierschenk and Rika Cosman, lived together a few houses farther than their parents on Breede Hilledijk in Rotterdam. They lived at nr. 164 and were taken together as young Rotterdammers with the first transport from Rotterdam Loods 24 to Westerbork in the night of 30-31 July 1942 and deported from there to Auschwitz on 3 August. This transport with 1013 d…