The purpose of this study is to examine the predictive effect of the variables of fathers' durations of working and spending time with their children on the aggression levels of 5-6-year-old children. The sample group of the study consisted of 90 children and their fathers. It was found that the fathers' daily and weekly working duration, the number of working days in a week, and the amount of time spent with their children at the weekend predicted statistically significantly the aggression level of 5-6-year-old children. The daily working duration of the fathers predicted 9% of the variance related to the aggression level of their children. The weekly working duration of the fathers predicted 5% of the variance related to the aggression level of their children. The time the fathers spent with their children at the weekend predicted 5% of the variance related to the aggression level of their children.