Here on chart page A3, we find Derk was the second child of WCP I. Jacoba (Koos) was the first. Going down the list we find Henriette Louise. She and her sister Helena, married and moved to Indonesia. Henriette married Willem Marius van der Veer, and Helena married Koors van der Veer. You can see and read more by clicking on the van der Veer Family link in the navbar above.