Of Isidor's and Clara's four children--Ruth, Ellen, Theo, and Robby, only one--Theo--survived the war, as he was not living in Latvia at the time.

Ellen Brenson (1896-1941)

Ruth's sister Ellen, an orthopedic physician; her husband, Yakov Meltzer, a pianist; and their son Anatol (6 yrs. old). All three were killed by the Germans in Nazi-occupied Latvia.

Ruth Brenson(1885-1941)
Born in Yelgava, Latvia. While temporarily staying in Moscow she met Stephan Kossman, whom she married around 1910. She had two children: Nora (b. 1911) and Leonid (b.1915). Ruth was killed in Riga by the Nazis.