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

Sybil was born after 1734.1   Sybil's father was James Rockwell and her mother was Abigail Loomis.  Her paternal grandfather was Joseph Rockwell; her maternal grandparents were Ebenezer Loomis and Jemima Whitcomb. She had four brothers and three sisters, named James, Ebenezer, William, Nathaniel, Abigail, Elizabeth and Lucy.  She was the second youngest of the eight children.1 

1 phelps.FTW @ Tree #0105
Further sources/citations:
World Family Tree Vol. 3, Ed. 1 @ Tree #3669, 3669.ftw