Princess Kate, Pippa and James Middleton to reunite for special event

As a doting aunt, the princess plays a significant role in the lives of her nieces and nephews, including Pippa's three children and James' son Inigo.

The family gathering is expected to bring together the Middletons, showcasing their tight-knit relationships.

Arthur Matthews, the birthday boy, is the eldest child of Pippa Matthews and her hedge fund manager husband James Matthews.

The couple, who reside on a sprawling estate in the Berkshire countryside, are also parents to Grace, three, and two-year-old Rose.

The Middleton have chosen to live in close proximity to one another.

Pippa's home is near her parents Carole and Michael Middleton's residence, as well as her brother James Middleton and his wife Alizee Thevenet's home.

Meanwhile, Prince William, Kate, and their three children reside at Adelaide Cottage in Windsor, a short drive away from the Middleton family homes.

The younger Middleton generation maintains a close relationship, as revealed by Kate's brother in a recent column for The Telegraph.

He shared an insight into their family gatherings, stating: "We'll often stop at my parents' house for tea or supper.

"My sisters and I are all within 30 minutes' drive, so there is often an aunt or a cousin passing through, too."

James also highlighted the role of cousins in caring for his son Inigo, mentioning: "The cousins all play their role in looking after Inigo - there's seven of them altogether at the moment."

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He added: "I think they're all impressed at how much of a mess Inigo can make. But there's lots of laughter and giggles about."

In a recent interview with HELLO!, James Middleton shared his admiration for his sisters' parenting skills.

He said: "It's been wonderful, seeing them become mothers and being so dedicated and strong. I'm in awe of that."

James also revealed that he takes parenting advice from Kate and Pippa.

He said: "I've been fortunate to see how my sisters have done it and take tips along the way - some I take on board, and others I'm like: 'Hmm.'"