This study explored the significance of grandparents in middle childhood and assessed the level of grandparental support provided to children in relation to other social network members. The association between grandparental support and grandchildren's mental and behavioural health was also examined. We conducted structured interviews with 120 grade 4 and 5 learners (mean age 5 10.41 years) from four schools in Cape Town, South Africa. Results indicated that subsequent to parents, children perceived grandparents as the most important and close relationship category. Furthermore, grandparents provided the highest levels of support to grandchildren after parents.Grandmothers provided more support than grandfathers. No associations between grandparental support and children's internalizing and externalizing behaviours were found. However, results revealed that grandparental support was positively associated with children's prosocial behaviour, independent of child gender, and the amount of support provided by other relationship categories (p 5 .04). Findings underscore a need for research to move beyond the nuclear family when considering potential influences on children's well-being.