Isaac Davids, the twin brother of Joseph Davids, was a son of Louis Davids and Jetje Moscoviter and born on 2 October 1915 in Rotterdam. On 24 May 1939, the 23-year old Isaac married in Rotterdam the non-Jewish Wilhelmina Cornelia Waaijer, a 16-year old daughter of Franciscus Waaijer and Johanna Elisabeth Pons. The couple had two children: Franciska in 1938 and Jettie in 1940.
Of the Davids-Waaijer family is further nothing known. Nor whether the family would have relocated to Den Haag after the bombardment on Rotterdam on 14 May 1940. But it appears from the archive of the Jewish Council that Isaac Davids in 1944 lived in Den Haag in the Poeldijkschestraat 75. Obviously he was arrested there in March 1944 for some “offence” and carried off to Westerbork on 29 March 1944 where he was locked up in the penal barrack 67. A few days later, on 5 April, Isaac Davids has been put on a so-called “penal transport” to Teresienstadt, possibly due to his mixed-marriage not to Auschwitz.
That 5th of April 1944, there has left a train from Westerbork to five different destinations: 240 Jews in cattle wagons to Auschwitz; 101 Jews in two passengers wagons to Bergen Belsen; 289 Jews in two wagons to Theresienstadt. Plus 41 women and children to Ravensbrück (one wagon) and 28 men to Buchenwald (one wagon), mainly Rumanian Jews. In Assen freight wagons were coupled with 625 Jews from Belgium for Auschwitz.
Isaac Davids eventually lost his life on 8 May 1945 in Theresienstadt.
Sources include the City Archive of Rotterdam, family registration cards of Louis Davids and Franciscus Waaijer; wedding certificate 2168 from Rotterdam, dated 25 May 1939 for Davids/Waaijer; the file cabinet of the Jewish Council, registration card of Isaac Davids; the Municipal Archive of Den Haag, certificate of death nr. C351 dated 23 February 1952 for Isaac Davids and the Wikipedia website jodentransporten vanuit Nederland.nl.