Isaäc Zwaaf was a son of Jacob Zwaaf and Christina Vleesdraager. He was born in Amsterdam on 24 Juli 1884 and earned his living as a cigar maker, as chocolate worker and as a shopkeeper of chocolate articles. On 4 May 1910 he married Bloeme Swaluw in Rotterdam, who was born on 11 April 1889 in Amsterdam as a daughter of Hijman Swaluw and Esther Springer.
The Zwaaf-Swaluw couple had four children, …