The conducted research investigates relationship between subjective well-being of children and their mothers because the well-being of a child is build upon the well-being of the whole family (Newland, 2015). The main goal of this research was to examine the contirbution of mothers subjective well-being to the subjective well-being of their children. Participants in the research were seventh grade students of primary schools in Varaždin and Osijek-Baranja Counties and their mothers. Total number of pairs student-mother was 251. Children filled out Student's Life Satisfaction Scale (SLSS), Brief Multidimensional Student Life Satisfaction Scale (BMSLSS) and one question about their happiness. Mothers filled out The Satisfaction with Life Scale (SWLS), Personal Wellbeing Index (PWI), Marital/Relationship Satisfaction Scale, one question about their happiness and an other about life satisfaction. The data used in this research were collected as part of the „CHILD-WELL“ project. The results indicate low significant correlation between the aspects of mother's subjective well-being and the aspects of their children's well-being and significant correlation between children's happiness/life satisfaction and gender (greater happiness/life satisfaction in boys). Hierarchical multiple regression analyses were conducted and they showed that there are two significant predictors of both children's happiness and their life satisfaction: child's gender and mother's happiness. Total regression model explained 13% of children's life satisfaction variance and 12,6% of children's happiness variance. Correlations between the aspects of mother's subjective well-being and the aspects of their children's well-being are greater in boys, except for correllation with mother's satisfaction with marriage/relationship. A mother's happiness is a significant predictor of boy's happiness and life satisfaction, but it is not significant for girls. Boys are more satsfied with family life, friends, place they live in and with themselves, while the difference in satisfaction with school was not shown significant.