It appears that Mary Morse and Inez May Morse may be the same person. Mary is listed in the 1860 Census as age 4 with birthdate of 1856 (no Inez is listed). In the 1870 Census no Mary Morse is listed, but there is and Inez Morse, age 13, with birthdate of 1857. I have included both census records for the family here for reference.
Age: 4; Birth Year: abt 1856; Gender: Female; Race: White; Birth Place: Ohio; Home in 1860: Pierpont, Ashtabula, Ohio; Post Office: Pierpont Centre; Dwelling Number: 1310; Family Number: 1313; Household Members, Age; Judah Morse, 40; Electa Morse, 37; Maria Morse, 13; Josiah Morse, 11; Amelia Morse, 9; Mary Morse, 4; Ancestry.com. 1860 United States Federal Census [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2009. Images reproduced by FamilySearch.
Name: Inez Morse; Age in 1870: 13; Birth Date: abt 1857; Birthplace: Ohio; Dwelling Number: 212; Home in 1870: Pierpont, Ashtabula, Ohio; Race: White; Gender: Female; Post Office: Jefferson; Attended School: Yes; Household Members, Age; Judah Morse, 50; Electa Morse, 47; Maria Morse, 22; Amelia Morse, 17; Josiah Morse, 21; Inez Morse, 13; Willard Wilbert, 47 Ancestry.com. 1870 United States Federal Census [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2009. Images reproduced by FamilySearch.
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