Dirk de Groot, born in Pingjum on February 2, 1870, son of Klaas de Groot (worker) and Jeltje Robijns de Jong.

Dirk was married before February 1, 1901, at the age of at most 30 (1) to
Christina de Vroom (aged at most 31 years), born circa 1870, died in Zaandam on February 1, 1901, aged approximately 31 years.

Dirk was married in Wonseradeel on March 4, 1903, at the age of 33 (2) to
Johanna Tuzee (aged 33 years), born in Groningen on April 20, 1869, daughter of Jan Tuzee and Geertruida Steenhuis, kindergarten keeper.