Correspondence between child and maternal perceptions of sibling relationship quality (standards, actual ratings, problems) and children's reports of daily interactions were assessed in 40 early adolescent children (M age=11.5 yrs) and their mothers (n=32). Children completed the Sibling Relationship Questionnaire (Furman & Buhrmester, 1985. Child Development, 56, 448–461) and Daily Checklist ratings of sibling interactions for 14 days. Mothers completed the Parental Expectations and Perceptions of Children's Sibling Relationship Questionnaire (Kramer & Baron, 1995. Family Relations, 44, 95–103). Overall, findings revealed correspondence between child perceptions of sibling warmth and maternal ratings of standards, actual ratings, and problems in sibling warmth but not conflict and rivalry. Maternal and child perceptions of sibling relationship qualities were positively associated with children's reports of ongoing interactions. Finally, regression analyses identified unique maternal and child correlates for both happy and prosocial daily interactions. Findings are discussed in light of recent research and theory on family dynamics. Copyright © 2010 John Wiley & Sons, Ltd.