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Male Abraham Blackman Click to view Abraham Blackman in the family tree

1   Abraham's father was Abraham Blackman and his mother was Sarah Loomis.  His maternal grandparents were Nathaniel Loomis and Sarah Ryley. He had four brothers and four sisters, and also a sibling of unknown gender, named Eli, Lemuel, Levi, Nathaniel, Esther, Lydia, Patty, Sarah and Eleazer.1 

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