A diagnosis of type 1 diabetes mellitus (T1DM) in childhood can have wide reaching implications for the child and their wider family system. The child and family’s physical and emotional wellbeing can be significantly impacted by the psychological adjustment and coping of the parents. Experienced peer mentoring is an intervention aimed at promoting wellbeing and adjustment amongst parents of children with chronic conditions. The intervention involves an experienced parent of a child with T1DM (Link Parent) offering informational, affirmational and emotional support to a parent of a newly diagnosed child (Recipient Parent). The aim of this study was to explore the experiences of such support from both Link and Recipient Parents’ points of view. Five Recipient Parents and seven Link Parents were recruited from a wider sample of parents who participated in the mentoring programme. They took part in a semi-structured interview about their experiences of providing or receiving peer mentoring. An Interpretative Phenomenological Analysis produced four super-ordinate themes for the Recipient Parents: Build up to and Initial Impact of Diagnosis; Content of support; Process of support; Impact of support. Four super-ordinate themes were also produced for the Link Parents: Attitudes towards the project; Support provided; Relationship with Recipient Parent; Understanding the impact of support. The results provided insight into the positive impact that offering and receiving such support can have on parents of children with T1DM. The results also highlighted the idiosyncratic nature of such experiences. The implications for future clinical application of the intervention were discussed as well as directions for further research.