GM v4.16 # 14630. 

This man's two daughters are shown as wives of Wilhelm Janzen. They may be the same person.

The contemporary Kornelius Duerksen #411857.
Yet another curiosity is the apparent fact that Kornelius' son Johann Kornelius Duerksen's father-in-law Heinrich Duerksen #14650 had a daughter Maria Duerksen #14653 with no listed husband, baptized 23 Jul 1786 and born "Abt 1770" curiously close to Kornelius' listed daughter Maria #53991 born "Abt 1770". 

Could all three of these girls (# 53991, #14631 and #14653) be the same person?
 
Allen Peters wrote about the many problems regarding this person in the California Mennonite Historical Society Bulletin No. 32: June 1995

"The 1835 census is changing many long-held beliefs about our family histories. An example of this is the Duerksen family. For many years, many Duerksens in the United States and Canada have traced their ancestry to a certain Johann Duerksen, born about 1750. A number of Duerksen family histories record the various branches of the descendants of this progenitor.

I began to worry about this connection when I came across the birth entries for a number of the Duerksen children in the Tragheimerweide Mennonite Church records in Prussia. These church records gave identical names and birth dates to those found in the Duerksen family books, but list the father as a David Duerksen.

Unfortunately, the death record of that David Duerksen gave an age that indicated he was born in 1761 rather than 1750. This meant that the oldest son listed in most Duerksen books, a Johann Duerksen (born about 1766, according to the 1835 census), could hardly be his child! This latter Johann was the father of Johann J. Duerksen, often called "Oel-Ohm," the ancestor of many American Duerksens.

A careful review of the 1835 census has settled the matter once and for all. The entry for household #3 in Alexanderthal shows a Cornelius David Duerksen, whose family information exactly reflects that found in the existing Duerksen genealogies. As a result, the census confirms he was the son of David rather than Johann. Likewise, the census entry for household #11 in Alexanderthal indicates that Johann Cornelius Duerksen, born about 1766, lived there with his family, including son Johann ("Oel-Ohm"), who was born in 1801. That entry clearly states that his father was a Cornelius Duerksen, rather than the Johann Duerksen also incorrectly given as the father of Cornelius Duerksen of Alexanderthal #3.

As a result, the 1835 census has corrected a long-repeated inaccuracy about the Duerksen ancestry. We can now begin to explore how these two Alexanderthal Duerksens were related to each other. They lived close to each other, giving us some reason to suspect that they possibly were cousins."