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The oldest, George, is the heir apparent.

There are also lots of eyes on her as the “stand-out star” of the royal family.

Kate Middleton holds Prince Louis

That leaves Louis, the youngest of the bunch.

This has led to him being referred to as an “underdog.”

Why should Kate Middleton, Princess of Wales, be any different?

Prince Louis as a baby

Emma Kenny, a TV psychologist, told OK!

But there are many princes and princesses who will never rule.

Known as “spares,” they hold a less prominent position than their heir apparent siblings.

Royal family on balcony

Princess Margaret was able to find her own way, though.