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(Gender unknown) Seneca Dewey Click to view Seneca Dewey in the family tree

Seneca was born in 1767 in Hanover, Graft., NH.1   Seneca's father was Simeon Dewey and his/her mother was Hannah Bliss.  His/her paternal grandparents were Simeon Dewey and Anna Phelps; his/her maternal grandparents were Samuel Bliss and Mary Loomis. He/she had five half-brothers and four half-sisters, named Jesse, Luke, Simeon, William Phelps, Joseph Langdon, Betsey, Cynthia, Sophronia and Paulina.  He/she died at the age of 47 on June 21st, 1814 in Hanover, Graft., NH, age 47.1 

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