I saw there has come out a book on Jews that were in Berlin during WWII. That is they were hidden  by Germans during the war. This I suppose must apply to the grandparents of my wife, Leah. They were definitely German Jews and were in Berlin during WWII. But how they managed to survive I never inquired about except just to ask once and never got any answer. It was like people that go through some kind of hard experience and afterwards cant talk about it.

My wife's mother herself had been on the kinder transport so she did not have any first hand information about how her parents had survived.