Even if the parents are taking full care to give equitable...
Even if the parents are taking full care to give equitable treatment to all the children, the element of jealousy, which is instinctive in human nature, will still be present in the children to some extent. Every child wishes to be the darling of the parents and none other should have this privilege. When he notices the parents expressing affection to the other siblings, he will feel momentary pang of jealousy.
The child will slowly understand that he has to share the affection of the parents with the other brothers and sisters. The others too have a right over the parents. The parents, with discreet handling of the situation, can make the child accept the other brothers and sisters and thus prevent him from continuing with his feeling of envy.
If you find that your son is envious of his brother or sister for some reason: he bullies them, pinches them, and uses harsh words with them, tries to deprive them of their shares of fruits and sweets, then he needs more of your attention. You should not close your eyes to these activities of the child. You must impress on him that he is growing big and his little brother needs more attention than him.
You must tell him that when he was a small kid like his little brother now, he too required and received more attention. Instead of trying to mend his ways strictly, impress on him that the little children are his own brothers and sisters. They too love him. If he didn’t love them, who would? He must protect them if someone else tries to hurt them. Allah has given to him such lovely brothers and sisters, for which he must be thankful.
In conclusion it is necessary to mention that maintaining totally equitable treatment to all the children might be Utopian. How can the parents treat the son, the daughter, the elder and the younger the same way? The elder children can generally be given more freedom. But the younger ones have to be given more care. The elder ones will get more pocket money. The younger ones require more protection. The sons are generally given more freedom of movement than the daughters.
Therefore, keeping in mind the need for equity and freedom, the parents have to adopt different approach for the sons and the daughters. This treatment might give to the children some hard feelings. But if the parents properly explain to them that they have the same affection for all the children, but the norms of behavior for people differ according to the gender and age.