About Wilhelm Ohrenstein
According to http://dasmuseen.net/Wien/Juden/judenliste_143/judenliste_143.htm, Wilhelm lived in Dapontegasse 9 in Vienna with his wife Friederike and children Kurt, Hans and Dolly.
He was an engineer and had a construction company, based at that same address, which was 'Arianised'.
He emigrated to Brazil with his wife and daughter Dolly. Kurt and Hans emigrated to Israel.