Mary Orr Harris (maiden name: Alexander) was born around 1805 in North Carolina. She married Robert C. Harris in Mecklenburg County, North Carolina, on March 1, 1831, and they had at least four children: Martha, born around 1832; Mary, born around 1834; Warren, born on January 24, 1836; and Moses, born around 1839. They lived in Mecklenburg County, and her husband worked as a farmer. By 1850, they owned $250 of real estate. A decade later, their wealth had grown to $5,000 of real estate and $900 of personal property, and by 1870, they owned $4,500 of real estate and $200 of personal property. Her husband died sometime in the 1870s, and by 1880, she was living with her son Warren in Mecklenburg County. She passed away on May 24, 1890.