2015). A person-oriented approach to diary data: Children's temperamental negative emotionality increases susceptibility to emotion transmission in father-child dyads. Abstract: The notion that some individuals are more prone to emotion transmission than others has prompted the need for a person-oriented approach to emotion transmission in parent-child dyads. The present study applied a person-oriented analysis to examine the patterns of emotion transmission that can be identified in the diary data of father-child dyads, and the extent to which children with high levels of temperamental negative emotionality are particularly susceptible to emotion transmission within the family. Mothers of 149 first grade children (age 6 to 7) completed questionnaires concerning their child's temperament. Mothers and fathers maintained diary questionnaires (for a total of 7 days) concerning their child's negative daily emotions, and fathers (n = 116) maintained diary questionnaires concerning their own negative daily emotions. Results of variable-oriented analyses with prospective change multilevel modeling showed, first, that emotions were, on average, not significantly transmitted in a father-child interaction. However, the person-oriented approach using multilevel mixture regression identified four qualitatively different patterns in the transmission of emotions. These results showed that the higher the level of a child's temperamental negative emotionality, the more typical it was for the father-child dyad in their daily life to show interaction patterns wherein the father's negative emotions were transmitted to the child.