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

Seth was born on March 27th, 1749 in Georgetown, ME.1   Seth's father was Samuel (Twin) Hinckley and his mother was Sarah Miller.  His paternal grandparents were Samuel Hinckley and Mary Freeman. He had six brothers and four sisters, named John, Edmund, William, Samuel, Josiah, Nathan, Mehitable, Mary, Sarah and Reliance.1 

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