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

Elizabeth was born after 1755.1   Elizabeth's father was Samuel Rockwell and her mother was Mabel Mehitable Loomis.  Her paternal grandparents were Thomas Grant and Elizabeth Rockwell; her maternal grandparents were Moses Loomis and Elizabeth Bidwell. She had three brothers and a sister, and also a sibling of unknown gender, named Gustavus, Thomas, Sylvester, Tryphena and Wereham.  She was the second youngest of the six children.1 

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