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This article devotes theoretical attention to the helping relationship in a sibling group including a disabled person. Having evoked the highly specific nature of the bond between brothers and sisters, which is, in the configuration of family ties, an eminently horizontal link, the author, a clinical psychologist, shows that the helping relationship comes into play very early in the construction of the sibling link with a disabled person. For a number of reasons, the brothers and sisters will occupy a caregiving function for the child, the teenager and then the disabled adult, a function that can nowadays be given legal status for people over the age of majority. The repercussions of this helping relationship both for the sibling group and the disabled persons themselves are investigated before concluding with an insistence on the need, in the future, to give greater consideration to the disabled persons’ point of view.