Mary and her sister Sarah are twins; on the 1850 census, both their ages are 4/12.
Mary and her parents and siblings are living in Ohio in 1850; by 1860, Mary and her siblings are living with a William Hamilton, possibly a relative of Mary's mother, in Indiana.
Sources
"United States Census, 1850," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/MX73-B16 : accessed 11 Oct 2014), S C Bridwell in household of James Hamilton, Nile, Scioto, Ohio, United States; citing family 75, NARA microfilm publication M432.
"United States Census, 1860," index, FamilySearch (https://familysearch.org/pal:/MM9.1.1/M4FZ-YZG : accessed 11 Oct 2014), Samuel Bridwell in household of William Hamilton, Sugar Creek Tp, Boone, Indiana, United States; citing "1860 U.S. Federal Census - Population," Fold3.com; p. 113, household ID 811, NARA microfilm publication M653; FHL microfilm 803245.
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