Prince Harry and Kate Middleton Have the Cutest Brother-Sister Relationship

"Harry called her the big sister he never had."

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We've seen a lot of Kate Middleton's marriage with Prince William, and obsessed over Prince Harry's romance with Meghan Markle, but we don't know much about Kate and Harry's relationship as in-laws. However, the Prince's new interview with Newsweek sheds light on his and the Duchess' close bond.

An excerpt from the feature reads:

Both in-laws live in Kensington Palace in central London, according to Newsweek, but Harry, 32, lives in a two-bedroom cottage on the grounds while Kate and William, both 35, live in a 22-room apartment in the palace itself. The proximity makes it easy for the two to bond and for Harry to play uncle to Prince George and Princess Charlotte. Apparently their downtime together often includes Game of Thrones binges, too.

"Harry appeals to her sillier side because he is carefree, footloose, and loves banter. He finds things funny about people and says so," source told Daily Mail last year. "Kate also adores the way Harry plays with her children—he is very good with them, a charming big kid and silly uncle."

Kate was always reportedly welcoming to Harry, even when she and William were still dating as students at St. Andrews University. Now, they and the Duke of Cambridge often carry out royal duties together, like helming Heads Together, their joint campaign on raising awareness on mental health.

Take a look at their sweet moments through the years below.

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Signaling the start of the Virgin Money London Marathon in 2017.

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'With Prince William promoting Heads Together in London in 2016.'

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'At the Grand Palace in Mons, Belgium in 2014.'

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'At a Thanksgiving service in London in 2012.'

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'Watching the Olympic Games in London in 2012.'

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'Watching the Order of the Garter at Windsor Castle in 2008.'

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Are In-Law Goals a thing? Because Harry and Kate might have just started them.

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Erica Gonzales
Erica Gonzales

Erica Gonzales is the Senior Culture Editor at ELLE.com, where she oversees coverage on TV, movies, music, books, and more. She was previously an editor at HarpersBAZAAR.com. There is a 75 percent chance she's listening to Lorde right now.