No, Sarah died after the 1880 cenus, which by the way was the census in which Nancy was in the home of William and Sarah. I mistakenly said the it was 1870. Also, the other sister, Mary Caroline (wife of Joseph Creger) died just after 1890. Nancy (if it is the correct Nancy), lived until 1887 and she died in a county a good distance from her last known residence.
If I am not mistaken, George out lived them all.