Eighty percent of U.S. children have a sibling. Siblings can be sources of companionship, play, and joy—as well as jealousy, rivalry, and aggression. A national survey found that one-third of U.S. children living with a sibling experienced sibling aggression in the past year.

Managing sibling fighting is one of the most common parenting challenges. Research shows that parents want guidance and strategies to reduce sibling aggression and promote positive sibling relationships.

Those seeking parenting advice for other concerns have abundant resources: parenting books, social media influencers, podcasts, and parenting education courses. Many of the latter are supported by research on their effectiveness and can be accessed online or through local family resource centers. Some parenting courses are tailored to new parents, divorcing parents, or those under the supervision of child protection agencies.

Because sibling aggression is such a common parenting challenge, it should be a major topic in parenting books and education courses, but in fact, it’s not usually covered. Most books and existing evidence-based programs focus on parent-child dynamics and positive discipline techniques, with little attention to sibling dynamics. Those parenting programs that do address siblings (e.g.,........

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