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

Medad was born on December 20th, 1760 in Westfield, Hampden, Massachusetts.1   Medad's father was Medad Dewey and his mother was Elizabeth Noble.  His paternal grandparents were Adijah Dewey and Mercy (Mary) Ashley; his maternal grandparents were Thomas Noble and Sarah Root. He had a brother named Solomon.  He was the younger of the two children. He had a half-brother and a half-sister, named Benjamin and Phineas.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