Elder family

I am looking for any information on John Abbot Elder and his wife Elma Christine Hillard who lived in Venango Co., PA.  He was b. 25 Jul 1860 in Callensburg, Clarion County, PA;  she 27 Jan 1861 in Clarington, Forest Co., PA. He was the son of George Washington Elder, b. 24 May 1832 in Licking Township, Clarion Co., PA, and Ellen Elvina Shaffer, b. 12 Dec 1831 in Leigh (?, maybe Lehigh) Co., PA.  What I am mainly looking for is the parents of Elma Christine.  I have nothing on her, so any help would be appreciated.  I would like to find free information, if possible.  Thanks very much.  Roberta Baum