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Male Oliver Day Click to view Oliver Day in the family tree

Oliver was born after 1769.1   Oliver's father was Adonijah Day and his mother was Sarah Loomis.  His paternal grandparents were Benjamin Day and Margaret Foote; his maternal grandparents were Caleb Loomis and Joannah Skinner. He had six brothers and seven sisters, and also two siblings of unknown gender, named Charles, Adonijah, Alvin, Levi, Elihu, Ira, Sarah, Lucy, Margaret, Rachel, Lydia, Rowena, Clarissa, Erial and Epaphroditus.  He was the youngest of the sixteen children.1 

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