Nowadays, people usually have a single kid so that they do not face the sibling issues. However, as soon as parents decide to grow their family, these kinds of issues start developing after having more than one kid. Usually, kids try to gain the attention of their parents and want to have more importance than the other brother or sister. It usually happens in every house where there are number of kids living together. There is nothing wrong in having a little bit competition among the kids until it becomes some rivalry amongst them. Competition is the healthy way of developing but crossing that line and developing it into some sort of rivalry is unhealthy for the kids.