This research aims to assess the effectiveness of a siblings support programme conducted at a large intellectual disability service provider in Singapore. The organization provides a range of services to people with moderate to severe level of intellectual and developmental disabilities. Participants in the programme were siblings of these clients aged between 13 to 20 years old. Using quantitative data obtained from questionnaires administered to 59 participants and quliative content analysis obtained from open-interview questions administered with 8 of the participants over a 5 year period from 2012 to 2016, the results were analysed to examine if the programme had met its intended objectives: 1. Create opportunities for siblings to obtain peer support, 2. Encourage discussion among siblings about their own personal identities and emotions, and, 3. Enabling siblings to lead future support groups. Overall, the results showed that the siblings support programme had encouraged sharing among participants and allowed them to develop friendship bonds with one another. It is hoped that discussion of these findings would encourage more practitioners to focus on supporting the needs of these siblings.