a quick Google shows that Vinegar's son, also called Joe, became a Brigadier General
brief details at the bottom of
History - Golden Knights Alumni
image of the son from that page
not convinced its the same guy though
wiki entry
https://en.wikipedia.org/wiki/Joseph...n_Stilwell,_Jr.
"He was lost at sea when flying with a friend in a DC-3 to Hawaii." - July 25, 1966
And this site
https://secure.flickr.com/photos/sheenachi/220478908/ makes it clear he was still in service and flying to Vietnam when he died
So, unlikely its either father or son