Born ‎1889 Amsterdam, Netherland‎. Son of Joachim de Rosa - Davidson and Sara Beer - Davidson‏

Born ‎26-11-1891 Amsterdam, Netherland‎, ‎1st marriage to: Gerrit de Rosa - Beer, ‎2nd marriage to: Moses Fischler - Eichhorn. Daughter of Joseph Hamburger - Witjas and Esther Rijksman - David‏