The profiles for this Neeltje and her Vanderbilt husband are almost devoid of good sources, and even the poorly sourced information is insubstantial.
I disconnect this Neeltje from the Van Cleef husband, since he was a younger man and the other Neeltje he is connected to as his wife was close to his age. But anyone interested in the family should be working on better sourcing, and on informative biographies.