Are you sure she is an "ar" Wistar, or perhaps an "er" Wister.There is a John Wistar, son of Richard, who was alive at the time you mention.John lived 1759-1815 and lived in Philadelphia and Salem County, NJ. He was married to Charlotte Newbold, and is our ancestor. There are many Elizabeth's in the family, but I do not find your Youngblood/Jung... in the Encyclop of Am. Quaker Genealogy.Perhaps she was not a Quaker????