Objectives: The aim of the present study was evaluation the relationship between solidarity and flexibility of the family and the styles of parenting to the severity of the stress of mothers in Child Breeding in the district 1 of Tehran. Method: The statistics community of this study included mothers of children aged between 3 to 6 years, and also these mothers have taken their children to the kindergartens of the district 1 of Tehran. The statistical samples in this study consisted of 192 mothers who were selected randomly. The mothers completed the questionnaire of the Bamrind Method of Parenting , the questionnaire the Scale of Solidarity and Flexibility of the Family and the questionnaire of the Stress of Mothers in Child Breeding. Results: The results demonstrated that there is meaningful correlation between solidarity and flexibility of the family and the methods of parenting to the severity of the stress of mothers in child breeding (P<0.01). The results of the multi-variant regression analysis indicated that the balanced solidarity, disturbed flexibility and autocratic parenting have the most effects on prediction of the stress of mothers in child breeding. Conclusion: Solidarity and flexibility of the family as well as the methods of parenting have positive correlation to the severity of the stress of parents in upbringing the children