After we started this exchange I checked the information I've acquired over the years and found Joel and Rebecca in my data base with two older children. This information is from Mary E. Hoffer's book Church Records Sugar Valley Clinton Co., PA, Logan and Green Twps., PA 1852-1956 (Pennsylvania State Society NSDAR, 1977), P. 122. Erah Daisy Karstetter was b. 14 Apr 1875 and christened 30 May 1875, and Samuel Alton Karstetter was b. 26 Mar 1878 and christened 30 Jan 1879. After discovering that I looked at the 1880 census for Logan Twp., Clinton Co. and found the family. According to that census "Erah" is really Eva.
I don't know if the book is still in print and can be ordered, but it has been filmed by the LDS church and could be ordered from your local Family History Center if you want to look at it.