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I found 6 other people living at Zimmerstrass 13 #5. Josef born 15 Feb 1905 (appears with birthday 15 mar 1905), Fajga born 14 Jun 1904, Chaja born 1920, Golda born 1 May 1928, Chana Szajna born 12 Aug 1931 (appears with the birthdate 19 July 1933). There was also Fawel born 8 October 1918 living with them. I think he's possibly a cousin or uncle since he would have been to old to be the child of Fajga and Josef.
I found him in the Lodz Ghetto Work Cards under Szulim RUBINSZTAJN born 23 April 1929, Worker number 75151, he was employed at Transport-Abteilung (transportation department) where he worked as a Wagenzieher. He worked since 19 Feb 1942 and he has a note on his card saying, "Kolonialwaren- und Brot-Abteilung vom 01-Jun-1944" which translates to, Grocery and bread department from 01-Jun-1944. He was in the ghetto for a very long time so I'm hoping there is more information on him in the following stages.