Betje Kroon was a daughter of Joseph Isaac Kroon and Roosje Polak. She was born on 3 November 1858 in Rotterdam, where she married at the age of 42 on 30 October 1901 the 36-year old doorman Leonardus Berlijn, born 8 April 1865 in Rotterdam as son of Benjamin Berlijn and Rosalie de Levita.
On 25 September 1902 their first born child was born, Rosalie, who however died already on 7 November 1902, j…