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Male Nelson Dewey Phelps Click to view Nelson Dewey Phelps in the family tree

Nelson Dewey was born on February 27th, 1859.1   Nelson Dewey's father was David M. Phelps and his mother was Zilpha Brooks Dewey.  His maternal grandparents were Henry Dewey and Amelia L. Dutton. He had a brother named Henry Alexander.  He was the older of the two children.1 

Family Details of Nelson Dewey's family with Anna M. Joslin

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