We're often told that sibling rivalry is a "bad thing", and that we should try to prevent it at all costs.
This is a shame, primarily because sibling rivalry is inevitable, so it follows that if parents think they should prevent it happening, sooner or later they're going to feel they have failed. It is also a shame because if you simply stop your children arguing, you deprive them of an opportunity to learn invaluable social skills.
Why do I say that sibling rivalry is inevitable, when many experts suggest that it is not? Let us look at life from a child's point of view.
At birth, humans are virtually helpless. It takes at least a decade before a newborn becomes sufficiently mature to survive independently. Completing much of our maturation after birth makes us the most adaptable creature on Earth - we learn to speak the language we hear around us, thrive on the foods available, and adjust to local cultural norms.
However, the downside of this adaptability is that while we're growing and learning, we must depend entirely on others to look after us. Our most precious resource is, therefore, the loving attention of our carers. The more we have, the more likely we are to survive.