Ybeltje Kornelis van Wieren, born on February 5, 1883, daughter of Kornelis Gerbens van Wieren and Sybrigje Ypes Poortinga.

Ybeltje was married in Dantumadeel on May 9, 1912, at the age of 29 to
Melle Castelein (aged approximately 26 years), born circa 1886 (?).