I don't know how much information you already have, but if I have the right person in Erath County, Texas, it looks like Sarah's husband was Benjamin W. Head. Sarah died in 1884, then Benjamin remarried. Eldora "Dora" had a twin sister Norah. You can find lots of information on the family at www.familysearch.org
. Try to search on Benjamin W. Head, with no other information at first. Also, if you have not been to the Erath County genweb site, there is a query from someone looking for the same family.http://www.rootsweb.ancestry.com/~txerath/
Finally, I would suggest posting a query on the Erath County message board (depending on whether I have the right family)!
I am not related, just trying to be helpful.