This cluster-randomized waitlist-control trial evaluated Multifamily Healing Spaces (MFHS), a culturally adapted behavioral family intervention for genocide-affected communities in Rwanda. Community members across five districts were screened through a staged triage process. Individuals with acute or severe clinical concerns were routed to clinical referral, those with individual mental-health needs were prioritized for Resilience-Oriented Therapy, and families were invited to MFHS when at least one screened family member met criteria for family communication difficulties. Twenty eligible clusters were randomly selected and then allocated to MFHS or waitlist control. The baseline cohort included 319 family members aged 12 years or older. The trial tested whether MFHS improved family resilience, parenting, couple and youth family-system outcomes, and secondary mental health, psychosocial, community, and livelihood outcomes from baseline to immediate post-intervention endline.