There is no mention of a "
David Stanton" in the index of Benjamin Thomas book on Stanton. (it's a pretty good index)
There is mention of a
David Stanton, the secretary's son, in "The Trial" by Edward Steers, in the chapter about Arnold and O'Laughlen by Percy Martin.
** Edwin Stanton had a sister, Oella. She died in 1862 and had a son named
David Stanton Tappan (born in 1845) who became a Presbyterian minister **
According to Geni.com, David's father Benjamin Tappan married twice after married to Oella, but before she died in 1862. However, the dates for births, marriages and deaths don't seem to add up to me on this web site. (especially in regards to Oella's other children and stepchildren?) My best guess would be David was Edwin Stanton's NEPHEW.
Here is the info on Oella, Edwin's sister, David's mother. There are links to other family memebers.
http://www.geni.com/people/Oella-Stanton...1000002684
and...
http://records.ancestry.com/Oella_Stanto...d=72468388
(I'm not good at this genealogy stuff)