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Objective To translate and culturally adapt the Parental Expectations and Perceptions of Children's Sibling Relationship Questionnaire (PEPC‐SRQ; Kramer & Baron, 1995) into Spanish and test its psychometric properties. Background Sibling relationships contribute significantly to child development; however, to date, no study has validated an instrument to assess the quality of children's sibling relationships with Spanish samples. Method We conducted two studies. In Study 1, the instrument underwent translation and back‐translation along with the inspection of semantic, linguistic, and contextual equivalence. In Study 2, the validity of the instrument scores was assessed by administering the translated PEPC‐SRQ to 229 mothers in Spain. Results The Exploratory Factor Analysis revealed a two‐factor structure that preserved the original 24 items. Both factors presented good internal consistency and were significantly correlated with other constructs. Conclusion These results support the use of the PEPC‐SRQ in Spain. Implications The Spanish PEPC‐SRQ may now be used as a tool for the early detection of conflictual relationships between siblings and as a tool for assessing the effectiveness of targeted strategies designed to bolster children's sibling relationships. Additionally, this adaptation provides the opportunity to carry out cross‐cultural studies.