The study focuses on siblings of children with disabilities (CD) in order to investigate: (a) basic components of the sibling personality (self-concept, selfesteem, feelings of loneliness, main needs, nature of anxiety, and attitudes), (b) the representation of family functioning and parental figures, and of social environment, and (c) sibling relationship. The sample consisted of 20 families raising a CD and 20 families raising children without disabilities (CWD). The total number of participants was 151 individuals (80 parents and 71 children). The measures used were the following: (a) self-report measures: (1) Self-concept Scale for Children Lipsitt There were statistically significant differences in the way they experienced sibling rivalry, maternal figures, and social environment. The study suggests that siblings of CD react in three ways towards their brother/sister: (a) they are protective, (b) distanced, and (c) present infantile behaviour.