Descriptions of gray divorce often include consequences for young adult children who are increasingly being left to cope with their parents’ decision. Adult children of divorce may experience different stressors and reactions than younger children especially during holidays; moreover, their increased social awareness leaves their parental relationship vulnerable to rupture as a result of pressure to choose sides. Interventions for helping young adults cope with their parents’ break-up are rarely described, much less evaluated. An online delivery format would be especially well-suited given the possibility of in-home participation at any time of day with privacy assured and negligible cost. We thus developed and experimentally evaluated Transitions, a two week internet-based program organized around a classic stress inoculation framework. The goals of Transitions are to foster stress-coping skills and to improve parent-child relationships throughout the divorce process. Our study was restricted to young adult college students (N = 95) who had experienced parental separation or divorce within the past year, and who were not receiving psychological services elsewhere. Participants were screened and randomly assigned to experimental and delayed-treatment control conditions; a priori analyses indicated sufficient power to detect large effects. During the first week of Transitions, participants received psychoeducation, training in progressive muscle relaxation, and a cognitive restructuring curriculum derived from Ellis and Beck. The second week began with a review and then introduced mindfulness meditation and communication skills. Practice sessions were embedded throughout the curriculum and simulations were specific to experiences of parental divorce. Videos of young college graduates sharing personal stories about their parents’ divorce were streamed between each module. Comprehension of the content presented in Transitions was monitored and coded for partial or full completion of the program. Outcome measures were keyed to the nature of the clinical problem and interventions deployed. A repeated-measures multivariate analysis of variance (RM-MANOVA) yielded a significant interaction. Univariate follow-up ANOVAs showed significant improvement relative to controls on stress but not on relationship variables. Neither moderator nor intent-to-treat analyses altered this outcome pattern. Future research will focus on refining the stress reduction components of Transitions and improving its impact on relationships with parents.