Mary Yant's parents were Philip Yant and Elizabeth Shroyer who were married 9 Mar 1820 in Stark Co., OH and had 7 children. Details of this family appear below.
Philip Yant b. 9 Dec 1792 Northampton Co., PA d. 20 Jan 1868 Stark Co., OH Elizabeth Shroyer b. 11 Jun 1802 Northumberland Co., PA d. 1851 Stark Co., OH
Daniel Yant b. 28 Mar 1827 OH Sarah Yant b. 1833 OH Mary Yant b. 1834 OH Martha Yant b. 1836 OH Eli Yant b. 1837 OH David Yant b. 1843 OH Elizabeth Yant b. 1846 OH
Before Philip Yant married Elizabeth Shroyer he first married an unknown spouse and had a son Joseph Yant b. 1815 OH. After the death of Elizabeth Shroyer he married Sarah Ulbrich b. 1800 PA on 28 Aug 1855. There were no children born to this union.
In the 1850 Census records for Philip Yant and family in Pike, Stark Co., OH , Mary Yant's age is listed as 16 years giving a birthdate of 1834. In the 1870 Census records for George Stultz and family in Huntington, Huntington Co., IN, his wife Mary (Yant) is listed as age 39 giving a birthdate of 1831. I have not been able to find a listing for Mary(Yant)Henline in the 1860 Census records. Mary Yant died 18 Dec 1878 according to some sources which seems to be confirmed by the fact that her son Roscoe I. Stultz age 14 is living with his uncle Harmon Stultz in the 1880 Census for Clear Creek, Huntington Co., IN.
The 1840 Census records for Philip Yant and family in Pike, Stark Co., OH list 1 daughter 10-15 years of age, and 2 daughters 5-10 years of age. If Mary was born 1831 she would be 9 years old in 1840 and could represent the 10-15 listing. Sarah age 7 and Martha age 4 would then represent the 2 daughters age 5-10. Mary's birthdate appears to be somewhat indefinite, based on the Census records.