Summary: The Four-Pronged Approach to Detecting a Dangerous Sibling Rivalry - Always supervise children playing together until the age of 4. Once they’re older, let them play on their own as long as you’re nearby and there isn’t a large power or age difference between them. - Spot clear, sudden changes and suspect sibling bullying as a possible cause, including underachievement in school, chronic, unexplained illnesses, or cycles of self-harm.
