John, have you found anything about the family of Dwan's from this post.
Michael Kelly whom you mention above married Margaret Dwan/Dewan/Duane. There were Duane's in Charleston, the one's I knew about have now pasted.
Margaret's father lived in Augusta Georgia. William Dewan. Future generations spelt the name Deween. Williams wife Ellen (though not sure if she is Margaret's mother) died @ Michael & Margaret's home in Charleston and was returned to burial in Augusta. Edward (living with Michael & Margareta for awhile) also returned to burial in Augusta.
Hope to hear from you.