Hi Miranda,
Your message is quite old so you may have gotten it answered by now but I thought I would try. Both Zwanenburg and Veen or van der Veen or van Veen are very common names in the Netherlands. I am also a Zwanenburg and my grandmother M A Bischoop Zwanenburg and her children come from Beverwijk. I didn't recognize the names you mentioned as part of the family but I don't know them all that well as I spent most of my youth in the U.S. I looked in the directory and there is a J J VD Veen listed at the following address and phone number.
Graaf Janstraat , 47 1947KE BEVERWIJK (+31) 251-274708
Good luck in your search.
Nanci
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