Caleb Mead married 'Mary Morse, b. in N. Y., Jan. 1780, d. in Fulton Co., Ohio, 4 Apr. 1854, daughter of Joseph and Irena (Hayne) Morse.'
Jan 1780 is too close to her sister Lydia's birth date (Oct 1779), if Lydia's birth date is correct. The 1850 census record suggests Mary was born possibly at the end of 1780 or the beginning of 1781.