Dirk Bos, born in Harlingen on February 11, 1896, son of Cornelis Bos (fairground showman, wafflebaker, bargeman, fairground showman and wafflebaker) and Susanna de Groot.

Dirk was married in Harlingen on April 24, 1919, at the age of 23 to
Trijntje Elzinga (aged 19 years), born in Almenum on August 15, 1899, daughter of Rinke Elzinga (baker's man) and Pietje Snoekstra.