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Male John Hinckley Click to view John Hinckley in the family tree

John was born on February 24th, 1764 in Georgetown, ME.1   John's father was John Hinckley and his mother was Hannah Oliver.  His paternal grandparents were Samuel (Twin) Hinckley and Sarah Miller. He had five brothers and four sisters, named David, Samuel, Miller, Ezekiel, William, Mary, Hannah, Sarah and Mehitable.1 

1 phelps.FTW
Further source/citation:
World Family Tree Vol. 16, Ed. 1 @ Tree #1604