Parents, take heart. Rivalry and arguments between siblings is natural and even beneficial. While it goes without saying that violence and bullying between siblings should always be stopped and dealt with, arguing and teasing actually has an upside, argues Signe Whitson in Huffington Post. Disagreements among siblings teach them to work through their differences, leaving them with important problem-solving skills that will serve them throughout their personal and professional lives. As they learn to navigate daily conflicts and issues, siblings may learn conflict-resolution, decision-making and listening skills as well as self-control and even empathy.
It is common for parents and society to rationalize fighting between siblings as “normal sibling rivalry,” which is a mistake, as it can unintentionally normalize destructive behavior, believes Izzy Kalman in Psychology Today. Accepting fighting between siblings as “normal behavior,” is a trap, because it brushes off issues that could, potentially, lead to serious bullying. Also, many people confuse the two meanings of "normal." While it can mean "being within the range of most people," it can also mean "psychologically healthy." By those definitions, sibling rivalry is normal since it's common, but it doesn’t mean that it's psychologically healthy.