This study examined the factors influencing the lying and stealing behaviors of a 16 year-old boy in a remarried family, as well as the factors affecting the subsequent decrease in the symptoms. The family—father, mother, and two children—participated in 14 therapy sessions, which included individual, marital, and family counseling. The researcher used grounded theory to code the qualitative data, finding that the son’s negative behaviors were influenced by the father’s strict rules, unilateral communication style, and physical abuse, along with the son’s suspicions about his step mother. The resolution of the son’s problems was linked to the father becoming more flexible, more functionally communicative, and less abusive, as well as the repair of the marital relationship.