Alliance is a robust contributor to the outcome of adult, youth, and family therapy, but little is known about therapists’ contributions to the alliance in conjoint family treatment. We investigated the predictive value of therapists’ personality, clinical experience and observed alliance building behaviors for mid-treatment alliance as reported by therapists and family members. Participants were 77 parents and 21 youth from 57 families receiving home-based family treatment from 33 therapists. Therapist openness to experience and agreeableness as well as therapists’ in-session engagement and emotional connection behaviors predicted more positive therapists’ and family members’ reports of the alliance. Therapist neuroticism, extraversion and conscientiousness predicted more negative alliance-reports. In-session safety behaviors also predicted more negative alliance-reports, but this finding was only significant for therapists’ and not family members’ reports of the alliance. Clinical experience did not predict quality of alliances. We conclude that training and supervision of family therapists could benefit from focusing on emotional connection with and active engagement of family members in treatment, and from increasing self-awareness of the impact of their personality on alliances with family members.

联盟是成人、青年和家庭治疗结果的有力贡献者，但对治疗师在联合家庭治疗中对联盟的贡献知之甚少。我们调查了治疗师个性、临床经验的预测价值，并观察了治疗师和家庭成员报告的中期治疗联盟的联盟建立行为。参与者是来自 57 个家庭的 77 名父母和 21 名青年，他们接受了 33 名治疗师的家庭治疗。治疗师对体验的开放性和宜人性以及治疗师在治疗期间的参与和情感联系行为预测了更积极的治疗师和家庭成员对联盟的报告。治疗师神经质、外向性和尽责性预示着更多负面的联盟报告。会议期间的安全行为也预测了更多负面的联盟报告，但这一发现仅对治疗师而不是家庭成员对联盟的报告有意义。临床经验并不能预测联盟的质量。我们得出的结论是，家庭治疗师的培训和监督可以受益于关注与家庭成员的情感联系和积极参与治疗，以及提高对他们的个性对与家庭成员联盟的影响的自我意识。