In the British royal family, there’s a concept known as “an heir and a spare,” which essentially means that the firstborn is the heir to the throne, while the spares are, well, spares. Prince William was the heir, and Prince Harry was the spare. Now, with the next generation, William’s son, Prince George, is the heir, while his two younger kids, Princess Charlotte and Prince Louis, are the spares. And one royal expert thinks the “burden” of being spares will do this for Charlotte and Louis’ bond.

Speaking to Harper’s BAZAAR, royal biographer Christopher Andersen said that since Charlotte and Louis are the “spares,” they’ll probably bond more throughout life.

“They pretty much lavish equal attention on all three, while at the same time nurturing their distinct and different personalities,

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