Hi Frank. I have seen the Ewan name in some of my gleanings, but not the Giberson. But, may I suggest this URL in Ancestry.com? (http://awt.ancestry.com/cgi-bin/igm.cgi
) It appears others have been working on your Israel Chew Ewan and may provide the answers you seek (if you have not already discovered this yourself). Although, as I was looking at it, it appears your ancestor is listed twice - once as a grandson and once as a son (making him his own uncle), so you may need to document which is correct. Frank P. Souder is also listed.
Also, are you related to a Frank Souder who lived in Barnsboro, wife Florence, kids - Lee, Rob, Marion, Jim, Dave & Jon?