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 Zwanenb…