Dee, I can help you a bit. Your ggg grandmother is Salome "Sally" Steffy the daughter of Michael and Magdalena Steffy. It is Magdalena that you translated as Duffy who was living with George and family on the 1850 census. George Shaffer d. 1 Apr 1890 Clay Lick, Franklin Co and is bu. in Church of the Brethren, Welsh Run, PA. His wife died 1886 in Franklin Co and is buried in same. As to the others on the 1850 census you listed, I can identify Nancy, Peter, both George's and Samuel. I may be able to identify the others with a bit more search time.