Jonas Wolffers was born 29 May1868 in Rotterdam as son of Lion Wolffers and Esther van Emrik. Jonas died 17 January 1941 in Rotterdam, 72 years old. Jonas married at age 42 on 25 January 1911 in Rotterdam Hendrika Knap, 32 years of age. Hendrika was born 25 March 1878 in Rotterdam. Hendrika died 05 June 1938 in Rotterdam, 60 years of age.
[source: cert. 287 & digitalestamboom.nl]
