We conducted a field study to test whether parents’ negative reactions to a natural disaster affected children’s reactions, together with the factors buffering this negative influence. Specifically, we examined whether parents’ posttraumatic stress symptoms following an earthquake were associated with children’s posttraumatic symptoms and their use of negative coping strategies. Theory of Mind (ToM) was tested as the factor allowing children to reduce the detrimental effects of posttraumatic stress symptoms on negative coping. Hypotheses were tested in a sample of elementary school children and their parents in the aftermath of the earthquakes that struck Northern Italy in 2012. Results revealed that mothers’ (but not fathers’) posttraumatic stress symptoms were positively associated with children’s posttraumatic stress symptoms, which acted as mediator on the use of negative coping strategies by children, but only among children with low ToM abilities. We discuss the theoretical and practical implications of findings.