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Male Cornelius Gillette Click to view Cornelius Gillette in the family tree

Cornelius was born on September 25th, 1835.1   Cornelius' father was Horace Cornelius Gillette and his mother was Sarah S. Watson.  His paternal grandparents were Horace Gillet and Rachel Austin. He had two sisters named Ellen Caroline and Sarah Watson.  He was the oldest of the three children.1 

1 World Family Tree Vol. 1, Ed. 1 @ Tree #2003
Further sources/citations:
World Family Tree Vol. 1, Ed. 1 @ Tree #2002, phelps.FTW