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Male Sanford Dewey Click to view Sanford Dewey in the family tree

Sanford was born on June 18th, 1829 in Sullivan , Tioga Co., PA.1   Sanford's father was James Babcock Dewey and his mother was Asenath Harding.  His paternal grandparents were Josiah Dewey and Hannah Babcock; his maternal grandparents were Samuel Harding and Love Mayhew. He had five brothers and four sisters, named James, Addison, Emery H., Solon Harrison, Henry Francis, Fanny, Sarah Helen, Lydia Jane and Isabella Diana.1 

1 phelps.FTW @ Tree #1353
Further sources/citations:
World Family Tree Vol. 1, Ed. 1 @ Tree #3310, phelps.FTW, World Family Tree Vol. 4, Ed. 1 @ Tree #2332, 2332.ftw