According to the Cook County birth records Ferdinand Neuckranz was born in
Heide, Holstein. Today, this area can be found on google maps under Heide, Dithmarschen, Germany.
The region of Dithmarschen has a good genealogy group. You should visit this website which
will tell you how to order his baptismal record:http://www.dithmarschen-wiki.de/Kirchenkreisarchiv
Just click on the English translation if you don't understand German. Of course, you can
wait to see if anyone else responds to your request for info on the family or you can just move
forward and do the research yourself. Naturally, you will have to pay. If Ferdinand's father
was an Ambassador, such would be revealed in the description of his father's position or job
in Ferdinand's baptismal record.
You might inquire further about proving this family lore as the people who put the website up may be able to help you.
I would explore the Dithmarschen website and learn about the area.