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Female Sybil Alvord Click to view Sybil Alvord in the family tree

Sybil was born on May 30th, 1777 in East Hampton, CT.1   Sybil's father was Ruel Alvord and her mother was Hannah Hall.  Her paternal grandparents were Seth Alvord and Elizabeth Spencer; her maternal grandparents were Hamlin Hall and Elizabeth Hall. She had three brothers and four sisters, named John, James Hall, Jabez, Mary, Lucy, Esther and Hannah.  She was the second oldest of the eight children.1 

1 phelps.FTW @ Tree #0105
Further sources/citations:
World Family Tree Vol. 3, Ed. 1 @ Tree #0105, 0105.ftw @ Tree #0105