This study evaluated a 6-session group parenting program, Tuning into Kids (TIK), as treatment for young children (aged 4.0–5.11 years) with behavior problems. TIK targets parent emotion socialization (parent emotion awareness, regulation and emotion coaching skills). Fifty-four parents, recruited via a child behavior clinic, were randomized into intervention (TIK) or waitlist (clinical treatment as usual). Parents reported emotion awareness/regulation, emotion coaching, empathy and child behavior (pre-intervention, post-intervention, 6-month follow-up); teachers reported child behavior and observers rated parent–child emotion coaching and child emotion knowledge (pre-intervention, follow-up). Data were analyzed using growth curve modeling and ANCOVA. Parents in both conditions reported less emotional dismissiveness and reduced child behavior problems; in the intervention group, parents also reported greater empathy and had improved observed emotion coaching skills; their children had greater emotion knowledge and reduced teacher-reported behavior problems. TIK appears to be a promising addition to treatment for child behavior problems.