They are the sole person responsible for their family’s future.

All children are responsible for looking after the family once they are older. But when you have a sibling you have someone with whom you can share the responsibility with. You can easily slack a little bit at times as you know someone else will be there to help out. But n only child has all the responsibility on their shoulder itself. They have no one to share the responsibility with. As a child that is a lot of responsibility to think about. So though being a single child has its own set of advantages, there are quite a few disadvantages that a child faces growing up. A sibling is generally the first friend a child has grown up, so that is always a big miss for anyone who is a single child.