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Male Erastus Knapp Dewey Click to view Erastus Knapp Dewey in the family tree

Erastus Knapp was born on April 20th, 1808 in Hanover, Graft., NH.1   Erastus Knapp's father was Asa Dewey and his mother was Jerusha Knapp.  His paternal grandparents were William Dewey and Rebecca Carrier; his maternal grandparents were Peter Knapp and Jerusha Unknown. He had a brother and three sisters, and also a sibling of unknown gender, named Asa, Eliza, Jerusha, Triphena and Loren.  He was the third oldest of the six children.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