Herbert's Gleiwitz residence card shows the same address in Gleiwitz - Wilhelmstrasse 59 - as Olga's. I assume he is her son by her first marriage.

Herbert, a professional pianist, emigrated to England in 1939 and subsequently sailed to Australia in 1940. His entry in the 1939 England and
Wales Register indicates that he was married; an Australian military service record gives his next of kin as a Margot Adler.