Willem Oonk and Hendrika Deur were married on November 13, 1859 in Holland, Michigan. They had eight children: Janna Harmina, Margje, Kaatje, Gertrude, Jan Willem, Hendrika, Gerrit, and George. Willem Oonk died in Fillmore, Allegan County, Michigan on April 23, 1900 and Hendrika Deur Oonk died on April 11, 1918. Hendrika Deur's brother, Jan (John) Deur married my great grandmother's sister. I have quite a bit of information on their line as well.