Research Findings: Early elementary school is a crucial time for the development of executive functions, but less is known about the impact of parent-child narratives on executive function development in children of this age group. This study aims to investigate the influence of parental scaffolding styles in parent-child co-constructed narratives in the development of transitional kindergartners' executive function. The sample comprised 35 Hispanic and non-Hispanic parent-child dyads, who were video recorded discussing a past experience at home. Video recordings were transcribed and coded for parental scaffolding strategies. Through principal component analysis, three scaffolding styles were identified: elaborative, eliciting, and echoing. Children's executive function was measured using the pencil tap task. Hierarchical linear regression analysis revealed that parents' echoing scaffolding style was positively and significantly associated with children's executive function outcomes, after controlling for child expressive language, maternal education, and parent dominant narrative languages. Practice or Policy: These findings highlight that the way parents scaffold their children's narratives can have a positive impact on their development of executive function. It also emphasizes the need for educators and practitioners to recognize the role of parent-child language interactions in supporting children's cognitive development, and to collaborate with families to promote positive developmental outcomes.