Objective: Studies show that joint parent-child activities have far-reaching effects on a child's emotional, cognitive, and social development. Research also reports the significant impact of mother-child relationships on mother-child interactions. The aim of this study was to investigate The Effect of Joint Reading in Mother-Child dyads on The Child’s Empathy and Emotional Regulation of the Mother.Methods: In the present study, which was conducted as quasi-experimental with the control group, 20 mother-child pairs from Alborz Elementary School in Sanandaj, by quota sampling, were randomly divided into two intervention and control groups. Data collection instruments included a Persian version of EmQue-CA for children and an emotional self-regulation questionnaire by Hoffman and Kashdan for mothers. The mother-child pairs in the intervention group read ten stories for 10 weeks, lasting thirty to forty-five minutes each with the mother and child. Data were analyzed using the ANCOVA and MANCOVA methods.Results: In the intervention group, mean empathy (27.60) and mean tolerance style (21.28) increased, and this difference was statistically significant (p<0.001).Conclusion: The results show that joint reading affects the child's empathy and the mother's emotion regulation. Reading the story helps the child gain a better understanding of the events and improves mother-child interactions.