Nancy Graham

https://www.findagrave.com/memorial/197061208/nancy-rachel-graham

There seems to be some dispute about the name of Peter's wife. Some researchers say her name is Nancy Rachel Tate, some say Nancy Elizabeth Lynn, and some say he had two wives.

However, there is information that Nancy Elizabeth Lynn was married to Peter's brother, William Graham, and the dates of their children's birth conflict with the dates of Peter's childrens' birth.

Therefore, I believe that Peter's wife's name was Nancy Rachel Tate and NOT Nancy Elizabeth Lynn as the latter would have had to be married and having children with both men at the same time.