The Reliability and Validity of the Lifespan Sibling Relationship Scale (LSRS) With an English-Speaking Young Adult Sample

The Lifespan Sibling Relationship Scale (LSRS) is the most comprehensive self-report questionnaire available to evaluate the quality of sibling relationships based on feelings, behaviors, and opinions across child and adult periods of development. To the best of our knowledge, the psychometric properties of the LSRS have not been assessed or reported in an English-speaking population since this assessment tool was introduced 20 years ago. The current study examined the internal reliability and construct validity of the LSRS with a sample of 370 young adults living in the United States. Results indicated that the original six-factor model of the LSRS is plausible with minor modifications to measure the sibling relationship quality and with its close correlation between factors and scales.