Hi. I don't know yet the surviving paths taken by my Grandfather's 3 brothers from Russia. Clues are that one was living in Kishinev around 1960. One had moved to Bucharest at some point. One MIGHT have migrated to Odessa.... and then descendants moved to Brooklyn in the 1990's.
But there is one strange coincidence. I was told by my Aunt (Jenny Tabacznik) that their cousins in NY who helped sponsor them to NYC in 1939 had urged them strongly in the 1940's to change their last name in the US ... to "TOBIN". I'm not sure anyone ever did. But I notice that your Tabachnick did change the family name to TOBIN. The same name. I wonder why/how that was?
What year did Murray Tabachnick immigrate to NY?