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This Wight genealogy says that Edward was from Sanford, and had a brother named Benjamin. The history of Harrison says that he was born in Limington, and gives him brothers Benjamin and John. The 1860 census gives Edward, Benjamin and John's place of birth as Sanford.
There were a couple of men named "Standley" in Sanford in 1790—John and Edward. A John Stanley was married in Sanford 20 Nov. 1788 to "Jerutia" Horn.