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Female Lavinia Dewey Click to view Lavinia Dewey in the family tree

Lavinia was born on November 6th, 1753 in lebanon, CT.1   Lavinia's father was Abraham Dewey and her mother was Grace Gates.  Her paternal grandparents were Josiah Dewey and Sarah Huchinson (Hutchinson); her maternal grandparents were Josiah Gates and Grace Rathbun. She had four brothers and three sisters, and also a sibling of unknown gender, named Abraham, Josiah, Sylvester, Freeman, Submit, Susannah, Amy Grace and Alpheus.  She was the oldest of the nine children.  She died at the age of 5 on May 20th, 1759 in lebanon, CT.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