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Male Nathaniel Rockwell Click to view Nathaniel Rockwell in the family tree

Nathaniel was born after 1733.1   Nathaniel's father was James Rockwell and his mother was Abigail Loomis.  His paternal grandfather was Joseph Rockwell; his maternal grandparents were Ebenezer Loomis and Jemima Whitcomb. He had three brothers and four sisters, named James, Ebenezer, William, Abigail, Elizabeth, Sybil and Lucy.  He was the third 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