The associations were studied between early mother-child co-construction of a separation-reunion narrative and children's concurrent and later (a) emotion narratives and (b) behavior problems. Fifty-one children and their mothers were observed during a co-construction task when the children were age 4 1/2. At ages 4 1/2 and 5 1/2, children's narratives were elicited using the MacArthur Story-Stem Battery (MSSB), and mothers completed the Child Behavior Checklist. Results showed that children who were more emotionally coherent during the co-constructions had MSSB narratives that were more coherent, had more prosocial themes, and had fewer aggressive themes at ages 4 1/2 and 5 1/2. Moreover, such children had fewer behavior problems at both ages. The relations between narrative processes and emotion regulation are discussed.