Emotion regulation processes in post-divorce parental relationships are analysed using thematic qualitative analysis. In two separate interview episodes, three and five years post-divorce, 55 people were interviewed: 10 couples and 35 individuals. Two themes emerged on how parents deal with their negative emotions after divorce. The first theme, emotion regulation flexibility, reveals how some parents effectively regulate negative emotions following the divorce. The second theme, emotion regulation rigidity, reveals that other parents retain feelings of anger, hostility, and resentment following the divorce as a consequence of dysfunctional emotion regulation strategies. This allows a deeper understanding of the processes of emotion regulation in family conflict, which may be easily applied in most therapeutic orientations.