Zacharias de Groot was a son of Victor de Groot and Rosette Agsteribbe. He married 11 January 1907 in Zaandam Jetje Vleeskruijer, daughter of Levie Vleeskruijer and Schoontje Godefroi. The couple had five children: one daughter passed away in 1921, 12 years old, two daughters have survived the Holocaust but not their sons Levie and Vicrtor.
The marriage ended by divorce in Zaandam on 1 November 1932.
City Archive of Amsterdam, archive card of Zacharias de Groot and Jetje Vleeskruijer.
In addition, a Jokos file (number 10058) on this person is at the Amsterdam Municipal Archive. Access is subject to authorization from the Stichting Joods Maatschappelijk Werk.