Henrietta Kok was my great-great grandmother, born in Holland and married to Popke Tillema. Their daughter was Antje Tillema Toppen (married to John and mother of Willi, Peter, Raymond, John and Henry Toppen) who was born Feb. 23, 1861 in Holland and died Sept. 12, 1917 in Mt. Greenwood (outside of Chicago), Illinois.
I recently discovered this branch of the family from Antje's death certificate and would be most interested in learning about the Kok family.