This study addresses the presence or absence of siblings influence on the personality. The position occupied in the family provides diversified experiences - consequently, some aspects of the personality are also different and individual. This sample includes 1142 university students: 874 females and 268 males. The statistical analysis indicated the existence of personality differences among the subjects that occupy the main sibling positions: the only, the oldest, the youngest and the middle. These were the facets of detachment: straightforwardness, altruism and compliance (in the domain of Agreeableness), dutifulness and deliberation (in the domain of Conscientiousness) and angry hostility (in the domain of Neuroticism). The results were discussed through Adler, Toman and Sulloway's siblings theories.
sibling position; only child; personality
