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Data of primary clients and partners (<jats:italic>N<\/jats:italic>\u00a0=\u200946) were analyzed longitudinally across baseline, posttreatment (5\u2009months), and follow\u2010up (8\u2009months). Alcohol use disorder (95%) and gambling disorder (5%) were in the severe range at baseline, and co\u2010addiction was 27%. Psychiatric comorbidity was 100%, and 18% of couples were jointly addicted. <jats:italic>Between\u2010group<\/jats:italic> comparison favored CCT in primary outcomes with medium\u2010to\u2010large effect sizes (Cohen's <jats:italic>h<\/jats:italic>\u00a0=\u20090.74\u20131.44). Secondary outcomes were also significantly stronger for CCT (Cohen's <jats:italic>h<\/jats:italic>\u00a0=\u20090.27\u20131.53). <jats:italic>Within\u2010group<\/jats:italic>, for all primary outcomes, a significant proportion of symptomatic CCT clients and partners improved, converging with ANOVA results of large effect sizes (0.14\u20130.29). All secondary outcomes improved significantly in CCT with large effect sizes (0.14\u20130.50). TAU showed significant within\u2010group improvement in alcohol use, other substance use, and life stress with large effect sizes (0.16\u20130.40). Primary clients and partners made largely equivalent improvement within CCT and within TAU. Results were triangulated with clients' satisfaction ratings and counselors' reports. Overall, significant within\u2010group effects were detected for CCT both clinically and statistically and between\u2010group difference favored CCT. 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