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Female Cornelia Lyman Click to view Cornelia Lyman in the family tree

Cornelia was born on July 20th, 1818 in Vernon, NY.1   Cornelia's father was Orange Lyman and her mother was Maria Dewey.  Her paternal grandparents were David Lyman and Mary Brown; her maternal grandfather was Stephen Dewey. She had four brothers and a sister, and also a sibling of unknown gender, named Stephen Dewey, Henry Martyn, Thomas, Edward, Mary Elizabeth and Eurotas.  She was the second oldest of the seven children.  She died at the age of 5 on July 26th, 1823 in Vernon, NY age 5 years 6 days.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