Rosetta Rebecca Beer was the second child of the second marriage of Nathan Hermanus Beer (1836-10921) and Paulina Scheffer (1851-1927). Rosetta was bprm on 18 November 1880 in Weesp. She lived with her parents and sibs among others at Nieuwe Zijds Voorburgwal 206 and Jacob van Campenstraat 63 in Amsterdam.
On 28 July 1904 Rosetta married in Zaandam Carel van Zwanenburg, a son of Nathan van Zwanenburg and Aaltje Lion. Carel was born in Rotterdam on 3 April 1875 and earned his living as a musician. He left Rotterdam for Utrecht in 1901 and in 1903 where he was registered as a mucisian too.
Rosetta and Carel had three children, viz. Hugo Nathan on 8 March 1905, born in Rotterdam but he died already after 2 months on 2 May 1905. On 8 February 1907 Adèle was born in Rotterdam. She married Simon de Leeuwe, had two children with him, Ruth and Ruben and all survived the Holocaust. Also the 3rd child, Pauline van Zwanenburg, who was born on 28 September 1908 in Rotterdam, has also survived the war , together with her husband Leo Leon van Leeuwen and their two children Carel and Eline.
However , Rosetta’s husband Carel van Zwanenburg passed away already at the age of 55 on 12 October 1930 in Rotterdam and he was interred in the Jewish Cemetery Toepad in Rotterdam. On the other hand, his widow Rosetta Rebecca van Zwanenburg-Beer, who lived at the address Schiekade 45a in Rotterdam, was after her arrest carried off to Westerbork and deported to Auschwitz on 12 October 1942, where she has been murdered in the gas chambers of Auschwitz-Birkenau on or approx 15 October 1942.
Sources include the City Archive of Amsterdam, Peoples Registers 1874-1893/N.Z. Voorburgwal 206 and Jacob v. Campenstraat 63; the file cabinet of the Jewish Council, registration card of Rosetta Rebecca van Zwanenburg-Beer; the Wikipedia website Jodentreansporten vanuit Nederland.nl and the certificate of death no.154 for Rosetta Rebecca Beer, wedow of Carel van Zwanenburg, made out in Rotterdam on 23 March 1948.