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Male Jacob Worthington Click to view Jacob Worthington in the family tree

Jacob was born after 1729.1   Jacob's father was Daniel Worthington and his mother was Elizabeth Loomis.  His paternal grandparents were William Worthington and Mehitable Graver; his maternal grandparents were Samuel Loomis and Elizabeth White. He had five brothers and ten sisters, and also two siblings of unknown gender, named Elias, Samuel, Daniel, William, Amasa, Elizabeth, Sibyl, Rhoda, Mehitable, Sarah, Tabitha, Abigail, Amy, Mehitable, Mary, Asa and Infant.  He was the nineth youngest of the eighteen children.1 

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