Warsaw directories of various types from 1784 to 1965 are full-text searchable at https://genealogyindexer.org. Warsaw is also part of many directories with coverage of all of Poland or other large geographic areas. You can see the list of Warsaw-specific directories included in the search at https://genealogyindexer.org/directories#Warsaw (scroll up a bit to see all-Poland coverage). By searching, you might discover other addresses where Adolf Tarnower lived or worked, but it's unlikely you will discover his sister's name in these sources, unless she was a co-owner of real estate.

Some Warsaw Jewish birth records for 1915 apparently survive, but I am not aware of any being online. See the inventory from the State Archives on szukajwarchiwach.

Logan Kleinwaks
kleinwaks@...
near Washington, D.C.