The Brother-Sister Questionnaire (BSQ; Graham-Bermann and Cutler 1994) is an instrument designed to measure qualities of sibling relationships.
AIM: In the present study the main objective was to examine the psychometric properties and validity construct of BSQ - Portuguese version. Data were collected among 197 adolescents. The Cronbach's alpha of the four domains ranged from.58 to.84. The psychometric characteristics of BSQ Portuguese version were found to be adequate. The results confirm the multi-dimensional model composed of four factors proposed by the authors of this instrument, as well as their suitability to assess quality of Portuguese sibling relationships. The BSQ offers a reliable and valid measure to be used within Portuguese population.