Cornelis de Jong, born in The Hague circa 1886, son of Cornelis de Jong and Gelske Feenstra.

Cornelis was married in Loosduinen on May 15, 1918, at the age of approximately 32 to
Jorina Hulsbos (aged approximately 24 years), born in Haarlemmermeer circa 1894, daughter of Leendert Hulsbos and Hillegonda Anna Lemmerzaal.