Ralph White was the husband of Margaret White, the son-in-law of Judith and John Brigham, the stepson-in-law of Harold Allison, the grandson-in-law of Sadie Cochran and the father of Carrie White and Rachel Lang. He was not involved in raising Carrie, although all versions strongly suggest that it was through his blood that Carrie gained her demonic powers.
He was also a fundamentalist Christian and believed, as did his wife, that all forms of intercourse were "sinful". However, it seemed that Ralph did not go to the same lengths as his wife, who thought even marital sex was wrong. After one night of raucous drinking with the men, Ralph came home and, heated by the booze, seduced Margaret, resulting in the pregnancy of his daughter. Months after the conception but shortly before the baby was born, some men were killed in a grisly construction accident, including Ralph himself. Carrie was a posthumous child as a result.
In the 1976 film of Carrie Ralph was only mentioned by name.
During the film, Carrie revealed at one point, that "he ran away". Margaret tried to convince her that her husband was tempted by "the devil" and taken away.
Carrie, on the other hand, had a more realistic view of what transpired, feeling it was not a "devil" but most likely another woman.
Barbara said, that Ralph was the father of Rachel. Rachel, herself possessing with similar powers like this of Carrie White, was also considered an outsider and outcast, although Rachel was more independent, outspoken and adapted to the world than Carrie was.