One of the things that might be pretty cool on this site is if we could collaborate. Toward that end, I've attached to his discussion what I have of Douwe Harmense and his children. Not much is sourced, or sourced very poorly. There are several holes in the story. Some of the notes might have conflicting information. But, it is, as they say, a start.
I invite anyone to download this and post here what you can add and what you can correct. If this works, we can walk through the line, generation by generation.
This GEDCOM was created with MacFamilyTree. If you have any issues with the file, let me know and I'll fetch the info and post it manually.
doug