Aim: The aim of the paper is to show the family as an important environment for developing the narrative competence of children. Narrative competence is defined as the ability to properly understand, reproduce and create stories, taking into account their linguistic complexity and relational character. Methods: Based on the literature the regularities regarding the stimulating nature of family (including siblings) exchanges for the proper development of children were described. As a material illustrating the course of family narrative training narrations of two brothers (four and eight years old) collected during four months of observation in natural environment were used. Results: Narratives collected from children at the beginning of the survey were different in the content – with preferences for describing negative, objective events by the younger and internal conflicts with positive internalized resolutions by the older narrator. In the course of mutual narrative exchanges both the content and structure of the narrative were changed through the process of modeling. The narrative exchanges between siblings stimulates their participants to reflect, be flexible, persistent and consistent, to negotiate and cope with distractions. Conclusions: Conclusions from both literature analysis and preliminary empirical research suggest that we should pay more attention to the figure of a “good enough” sibling as an important part of the family system influencing human narrative development.