Know your child
Children should be encouraged to interact with various age groups. This is very important and will indicate whether they are developing any superiority or inferiority complex or if they are becoming introverted or extroverted.
Children with an inferiority complex like to interact more with children younger than them. They will try to avoid the older ones and may even try to avoid those of the same age. Those with superiority complex will try to shun the younger ones and will only want to relate to those older than them.
By encouraging interaction with all age groups, they can be moulded into balanced and flexible human beings with personalities free of complexes.
--Sri Sri Ravi Shankar