Group mentoring has received much less empirical attention than one-on-one mentoring and it is not clear whether group programs can be expected to yield similar outcomes or whether the mechanisms of change are similar compared to one-on-one mentoring programs. This study examined the effects of a group mentoring intervention on quality of relationships with parents and peers for 71 program participants relative to a comparison group of 31 students. Further, analyses were performed among program participants only to determine effects of sense of belonging with mentor and mentoring group on changes in quality of relationships with parents and peers. Findings revealed no program effects, yet among program participants, findings revealed that sense of belonging with mentor and group are important in predicting changes in quality of relationship with fathers and peers.