Many studies have focused on factors affecting the religious agreement between parents and adolescents. Surprisingly, few studies have examined the effects related to the parent-adult child relationship. The present study examines the factors related to religious agreement between parents and their adult children. One hundred forty seven respondents in the Denton, Texas areas were interviewed. The telephone survey instrument encompassed questions about family relationships including some questions regarding religious beliefs. Results confirm that good relationships among parents and grown children are highly related to the grown children's holding similar religious beliefs as their parents.