Carrie was the younger sister of Priscilla. After their parents died, the sisters lived together. Although Priscilla was the eldest sister, she was more carefree, so that Carrie had to take care of them both.
After Priscilla married Owen, they lived in a back-to-nature hippie commune, and cause of that sisters almost never met. Despite this, Carrie helped her sister to give birth to her daughter, Anna Marie.
After Priscilla's disappearance Carrie took over Anna's care and, in her grief at the loss of her sister, was a strict and authoritarian guardian.
Years later, when Rogue returned home, they reconciled.