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Objectives: This study examined the relationship between mothers' happiness and children's executive function difficulty, focusing on the sequential mediational role of children's happiness and media device addiction. Methods: This study used data from the 10 th (2017) Panel Study on Korean Children (PSKC). Study participants were 1,366 mothers and their children, all of whom were 9 years old. Data analysis was performed using SPSS 21.0 and SPSS macro. Results: First, mothers' happiness was found to have a significant direct effect on children's executive function difficulty. Second, both children's happiness and media device addiction were significant single mediator on the relationship between mothers' happiness and children's executive function difficulty. Third, the indirect path linking mothers' happiness and children's executive function difficulty through children's happiness and media device addiction was significant, and the sequential mediational model was supported. Conclusion: This study revealed that mother's happiness, children's happiness, and media device addiction should all be taken into consideration when explaining executive function difficulties in children. Specifically, the strategy to improve children's ability to self-regulate their media device use by promoting their happiness through improving mothers' happiness will help improve problematic executive function. These findings may contribute to the development of an integrated intervention plan to improve the executive function of school-age children.

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The purpose of this study is to investigate the effects of father's play beliefs on father-child interaction and child's social skills. The subjects were 370 fathers of 1, 2 and 3 graders of elementary schools who lived in Seoul and Gyeonggi area. The results were as follows; First, the differences were found to be significant between the whole of father's play hours, play focus beliefs, study focus beliefs and father-child interaction, and their sub-variables of disciplinary action, sensitiveness, and affectionate expression; and between the whole of child's social skills and its sub-variables of cooperative action, self-assertion and self-control. Second, the higher play focus beliefs, the more positive interaction on the child, and specifically they use much democratic disciplinary action, sensitiveness and affectionate expression. Third, as to the effect of the father's play focus beliefs on the child's social skills, father-child interaction was found to act as a partial parameter, while as to the effect of the father's study focus beliefs on the child's social skills, father-child interaction was found to act as a full parameter.

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