Anna Skiff's parents were Charles Skiff and Susannah Cowden.
Nye's book is good but it contains a few errors. Asa Button aged 70-80 is listed in the 1840 census in Geneva, Ohio. His son Amos Button moved there after 1840. I believe this Asa was Shubal's brother that Anna Skiff Button married.
Anna Skiff's 1st son Charles Skiff Sanford by Peleg P Sanford married Amos's daughter Eliza and lived in Geneva before moving to Michigan.