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Male Adonijah Gillett Click to view Adonijah Gillett in the family tree

Adonijah was born after 1747.1   Adonijah's father was Samuel Gillett and his mother was Hephzibah Loomis.  His maternal grandparents were Hezekiah Loomis and Hephzibah Thacher. He had a brother and four sisters, and also a sibling of unknown gender, named Simon, Hephzibah, Lucy, Ruth, Elizabeth and Demas.  He was the third oldest of the seven children. He had a half-brother named Simon.1 

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