“I hate to say this to all mums listening but they are really good sleepers,” Eugenie added.

Questioned on how she’s bringing up her boys, the princess said: “Manners maketh man’ – I’m trying to do that with my kids right now.”

It’s the same method Meghan has spoken about using.

During her interview with The Cut last summer, the Duchess of Sussex spoke about how she’s raising her son, Prince Archie, four.

The 42-year-old said: “We always tell him: ‘Manners make the man. Manners, manners, manners, manners, manners.'”

Eugenie also revealed how her older sister, Princess Beatrice, is “annoying when she wants to be” and she herself is “annoying to her back”.

She added that even though the two siblings annoy each other occasionally, they love each other and are the best of friends.

The royal said of her older sister: “She’s a great mum, I always ring her for nearly everything.

“‘What do I do about this? What do I do about that?’ Same goes for my mum. Literally, constant.”

The princess added that she and her sister have “always had each other” their whole lives.

“We’re the only ones going through exactly what the other is going through at exactly that time as a girl – in our family, our place of work, whatever it is. I think that’s extraordinary to think about.”

“We’re not twins, yet you go through life knowing exactly what the other one is going through. She’s my big sissy, she’s a legend.”

Eugenie then admitted: “She’s annoying when she wants to be and I’m really annoying to her back, but we love each other, best of friends.”