Informal caregivers represent around 10 % of the Belgian population. They are 20 % of parents. Support groups are recognized as respite formulas. This contribution examines the commitment logics of the participants as well as stakeholders of such devices, based on results of an exploratory research having with grounded theory method. First, the impacts of natural caregiver’s experience are discussed. Then, the commitment logics within a support group are discussed. These relate to respite, activities, information, social integration, mutual aid and activism. These results suggest that informal caregiver support groups contribute to the goals of different group modalities.