Little research within the couple and family therapy field has specifically addressed the influence of infidelity on members of the family outside the couple sub‐system. The purpose of this exploratory quantitative study was to utilize the lens of contextual therapy to explore the influence of parental infidelity and interparental conflict on adult children's (N = 703) reports of vertical relational ethics, including subscales measuring trust and justice, loyalty, and entitlement. Results from multiple regression analyses demonstrated that both higher levels of interparental conflict and the occurrence of parental infidelity were associated with lower levels of vertical relational ethics, which often takes the form of decreased trust in family members and increased potential for loyalty conflicts. Implications for addressing relational dynamics related to parental infidelity through systemic family therapy, as well as recommendations for future research, are discussed. Practitioner points Therapeutic assessment should include questions about influence of transgenerational patterns of infidelity and conflict between partners on parenting experiences. Acknowledge young and adult children who feel caught in a split loyalty between parents and how they cope with these loyalty conflicts. Engage clients in dialogue concerning how to restore the balance of offering and receiving care, support, and connection within family's unique cultural context. 父母不忠和父母间冲突对成年子女和父母之间的关系道德的影响：从情境的角度思考 在夫妻和家庭治疗领域, 鲜有专门针对不忠行为对夫妻亚系统以外的家庭成员的影响的研究。这一探索性的定量研究的目的是运用情境疗法的视角探索父母不忠行为和父母关系冲突对成年子女（N=703）在纵向关系道德方面（包括信任和正义, 忠诚, 和权利的分量表）的影响。多元回归分析结果显示较高的父母间冲突以及父母之中存在不忠行为都和较低的纵向关系道德相关, 通常表现为对家庭成员的信任度降低和有关忠诚的冲突的可能性增加。本文讨论了用系统家庭治疗处理与父母不忠行为有关的关系动态的可能性, 以及对未来研究的建议。 对实务工作者的启示 治疗性评估应该包括不忠行为的跨代传递模式的影响和伴侣之间在教养方面的冲突。 认识到幼年和成年子女可能经历的对父母忠诚度不一致以及他们如何处理这一情况的问题。 与来访者开展关于在家庭的独特文化背景下重新平衡地给予和接受关心、支持、联系的讨论。 关键词: 成年子女, 情境疗法, 不忠, 代际关系, 父母间冲突, 亲子关系, 关系道德, 信任