Research on sibling aggression remains limited despite growing evidence that aggression towards siblings is associated with negative adjustment outcomes. The current study advances the field by examining proactive and reactive aggression toward siblings in middle childhood. Specifically, this study utilized youth self-reports to 1) evaluate the 6-month stability of sibling proactive and reactive aggression, 2) compare rates of sibling aggression to peer aggression, and 3) evaluate links between sibling proactive and reactive aggression and internalizing symptoms (depression and anxiety). Findings indicated stability in both sibling proactive and reactive aggression, and rates of sibling aggression were higher than rates of peer aggression at both time points. Further, as anticipated, both sibling and peer reactive, but not proactive, aggression were uniquely positively associated with internalizing symptoms. Results suggest that sibling proactive and reactive aggression can be reliably assessed and are associated with expected outcomes, but peer aggression demonstrated stronger clinical utility than sibling aggression. Future directions are discussed.

尽管越来越多的证据表明，对兄弟姐妹的攻击与负面的调整结果有关，但对兄弟姐妹的攻击的研究仍然很有限。当前的研究通过研究对童年中期兄弟姐妹的主动和被动攻击来推进这一领域。具体而言，这项研究利用青年人的自我报告来：1）评估兄弟姐妹主动和反应性侵略的6个月稳定性； 2）比较兄弟姐妹侵略与同伴侵略的比率； 3）评估兄弟姐妹主动和反应性侵略与内在症状之间的联系（抑郁和焦虑）。研究结果表明，同胞的主动和反应性攻击都稳定，在两个时间点同胞的攻击率均高于同伴的攻击率。此外，正如预期的那样，同级和同级都是被动的，但不是主动的，侵略性与内在症状呈正相关。结果表明，同胞的主动和反应性攻击可以得到可靠的评估，并且与预期的结果相关，但是同伴的攻击表现出比同胞的攻击更强的临床效用。讨论了未来的方向。