Jantje de Bock, born in Haulerwijk on June 8, 1874, daughter of Egbertus Bernardus Jacobus de Bock and Lucia Theodora Pierik.

Jantje was married in Leeuwarden on May 19, 1897, at the age of 22 to
Johannes Baukes Feenstra (aged 33 years), born in Workum on September 19, 1863, son of Bauke Johannes Feenstra (sailor) and Sybrigje Pieters Katsma, shop assistant and officer Salvation Army.