Princess Kate and her aunt-in-law Princess Anne get along well, as they demonstrated when they attended their first joint engagement last year.
However, the royals typically approach meeting the public very differently.
While the Princess of Wales has often been spotted shaking hands with royal fans during walkabouts, the Princess Royal was raised with the idea that it's better not to, following in the footsteps of her late mother, Queen Elizabeth II.
Princess Anne explained her approach in an interview a few years ago, as part of an ITV documentary called Queen of the World, which aired in 2018.
Reflecting on how meeting the public has changed since she became a working member of the royal family, the mother-of-two said: "I mean we never shook hands".
She went on: "The theory was that you couldn't shake hands with everybody, so don't start. So I kind of stick with that, but I notice others don't."
Referring to younger members of the royal family, Anne added: "It's not for me to say that it's wrong, but I think that the initial concept was that it was patently absurd to start shaking hands.
"And it seems to me that it's become a shaking hands exercise, rather than a walkabout, if you see what I mean. So that has changed."
The Prince and Princess of Wales also appear happy to pose for selfies when they meet the public, but Princess Anne is less keen.
The late monarch's only daughter continued: "I'm glad I'm not starting now, because at least you had people to talk to, and now you don't really. Phones are bad enough, but the iPads, you can't even see their heads. You don't know who you're talking to".
She went on: "And I do get slightly, I either don't bother, or just say 'Look if you want to ask, you know, meet somebody, I suggest you put that down.' It is weird, as people don't believe that they've experienced the event unless they've taken photographs. And usually you're standing immediately in front of them."
Queen Elizabeth felt the same as her daughter when it came to technology use. In 2014, US ambassador Matthew Barzun revealed to Tatler that the Queen considered it bad manners for well-wishers to be looking at a screen when she made public appearances.
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"She was essentially saying: 'I miss eye contact,'" Matthew said, adding that she found the selfie trend "disconcerting" and "strange".
Kate delighted fans earlier this year, however, when she posed for a series of selfies in the changing room with the England rugby squad, although they weren't all as flattering as her typical photo shoots.
In snapshots shared to Twitter, the Princess could be seen laughing, giving a thumbs-up and in one photo, closing her eyes just as the picture was taken!
The candid images from the team's dressing room were posted to the social media site by England player Maro Itoje, who posed alongside the Princess in the first picture and captioned them: "The old camera flash strikes again [camera emoji, red rose emoji] @englandrugby @KensingtonRoyal".