When I searched for L. Doroszow two names came up (same person) and that was Leon Doroszow born 7 July 1924 and he lived at a number of addresses. BUCHBIND 21 flat 10, SCHARNH 32, moved on 4.12.42 to MUEHL 2 and moved again on 6.10.43 to NIEMOJEW 1. He also had "IRRT ABG" and I'm not sure what this refers to. I know ABG means change of address but I'n not sure what IRRT means.
I also was searching and found Leon under MOJSZE LEON DONOSZOW with the same birthdate, addresses, and move date.
I found Rywka Doroszow born 17 May 1892 and died 5 April 1942 living at the same address as Leon. I'm guessing she's his mother and she's the only person I found to be Leon's family. I also searched through the other stages and didn't find anymore on Leon.