Siegfried Liebenau was a son of Sally Liebenau and Flora Wilhelm, born 19 February 1899 in Berlin. He was married twice; of his first wife Margot Wolff, born 1 April 1905 in Hamburg is known that she has divorced him in 1932 in Den Haag and that afterwards she remarried Percival Slark Strange, born 1872 in Williton, Somerset (England), in 1937 in Holborn (London). Of this couple is nothing further known.
Afterwards Siegfried Liebenau lived at Constantijn Huijgenslaan 20 in Bussum, untill he married again 16 July 1942 in Amsterdam Elisabeth Okker, a daughter of Isaac Okker en Engeltje Sarlui. 24 August 1942 he moved from Bussum to Amsterdam and lived with his wife at Edelweisstraat 143 down floor.
After again a removal per 6 April 1943 to Transvaalplein 1 1st stock, Elisabeth Okker was fetched 20 June 1943 during the big raid in Amsterdam and deported that same day to Camp Westerbork, where she had to stay in barack 57. However, notes on her registrationcard of the Jewish Council from 23 June this message from Berlin reads "that the person concerned was allowed to return to Amsterdam" and she has been released from Camp Westerbork 26 Juni 1943.
Her spouse had gone into hiding and according notes on his registration card of the Jewisch Council, made 3 September 1943, it has been established that "the person concerned has never been in Camp Westerbork". Further notes on both their registration cards show that both "have returned from hiding" and that their address since 28 August 1945 had become Schubertstraat 66 in Amsterdam.
City Archive of Amsterdam, archive card of Siegfried Liebenau; Municipal Archive of Den Haag, family registration cards of Siegfried Liebenau and Percival Slark Strange and the file cabinet of the Jewish Council, archive cards of Siegfried Liebenau and Elisabeth Liebenau-Okker.