The Mary that was living with Samuel and Mary Callicott in 1860 was the daughter of Samuel's deceased brother Claiborn H. Callicott who died Dec 1853, leaving widow Juliet and children Ellen, John and Mary. Ellen and John lived with Samuel's brother John A. Callicott in 1860 and Mary was with Samuel. I have Mary as marrying Benjamin Hill May 31, 1867. Samuel died in civil War Dec 1862 and Mary remarried in early 1870's to Milton Patillo and I have guardianship papers for Milton becoming guardians to Samuel and Mary's children, Alvin and his sister Martha.
Claiborn's son John married june 12, 1872 to Mary Murphy. I don't have marriage for Ellen.