Jacoba Adriana de Heer was a daughter of Jacob de Heer and Roosje van der Ham. She was born on 11 December 1895 in Rotterdam and married there Meijer Cohen on 13 October 1921, a son of Philip Cohen and Mina Eismann. Meijer was born on 2 July 1896 in Rotterdam, earned his living as a merchant with water pipe articles and as commercial traveller with tools. Meijer and Jacoba had a son together, Phi…