Professor Alexander Sergevitch Bernstein

Source: 1913--1996- The Eger Family Association- pg.14. According to the source, in 1996 he was alive.

However, in all other sources only one son of Sergey Nathanovich Bernstein, German Bernstein, is mentioned.

It is very likely that the book erroneously assumed that the Alexander Sergeevich was a son of Sergei Nathanovich. Possibly this is the Aleksander Sergeevich Bernstein , a grand nephew of Sergei Natanovich, son of his nephew, professor Sergei Alexandrovich Bernstein.