After a divorce, parents and children try to minimize each other’s distress by hiding their feelings and pretending they are doing fine, a coping strategy called protective buffering (PB). Although there is substantial evidence that PB among romantic partners harms both partners’ well-being, the consequences of PB in parent-child relationships remain unclear. To examine PB among parents and children, we conducted a survey study among 100 dyads of Dutch divorced parents and their adolescent children. We examined actor and partner effects of PB on post-divorce adjustment. We additionally investigated whether decreases in authenticity and intimacy explained the association between PB and post-divorce adjustment. Data were analyzed by employing an Actor-Partner Interdependence Model (APIM) and an APIM extended to Mediation. Results revealed that PB was negatively associated with parents’ life satisfaction, and to children’s life satisfaction and divorce-specific well-being. These negative actor effects were mediated by decreased authenticity for both parents and children. Consistent with research on PB in romantic relationships, PB not only impeded own post-divorce adjustment, but also the adjustment of the person participants tried to protect. Specifically, children’s PB was negatively associated with their parents’ divorce-specific well-being. Although further research is needed, the present study was the first to provide insights into the paradoxical effects of PB in parent-adolescent relationships