Hi Tinah, Mary's name doesn't look active and this is from a post back in 2003, so it is unlikely she will receive your message. I am not related but I have been able to find some documents.
One problem is that I found a conflict in the passenger list naming Dick's father as Arie, but when you search for Zetten on wiewaswie.nl I can only find a Dirk Peter (very close) but his father is Jan Hendrik.
So I am not sure,
Note that on the 1920 census just after they got married it shows a Poelakker family as their neighbors, possibly they are the parents of Janet Poeakker.