The study examines two diaries, both written in Hungarian in the mid-nineteenth century by young female authors (Countess Anna Kornis and Antónia Kölcsey). The diaries are approached from the point of view of the interpretations of emotional bonds and relationship patterns offered by the two girls in their descriptions and portrayals of their relationships to their siblings. In the case of Anna Kornis’s diary, I focus on the narrative passages concerning her relationship with her sister. Antónia Kölcsey’s more conflict-ridden relationship with her brother is worth comparing with the relationship between the Kornis sisters. I examine the passages in the two diaries concerning sibling relationships against the backdrop of the paradigm shift familiar from the family history and emotional history secondary literature and the portrayals of sibling relationships in the novels of the period. What kinds of linguistic tools and rhetorical formulae were used to interpret and narrate the emotional content and dynamics of the sibling relationship?