The royal family is making the most of the second week of their "babymoon" in Mustique

By Simon Perry
Updated February 03, 2015 02:45 PM
Credit: John Stillwell/PA Wire

Hanging with the in-laws for vacation is not everyone’s cup of tea. But for Prince William, on vacation with wife Kate and George, it is just the tonic.

He has skied with Kate’s family, hosted his in-laws in Scotland at Queen Elizabeth‘s Balmoral estate and taken several winter vacations with them to Mustique.

Now, the latest pictures out of the exclusive Caribbean island show William relaxing after a swim, as sister-in-law Pippa Middleton, 31, and brother-in-law James Middleton, 27, look on. In swim-shorts and with goggles in hand, it’s clear that ace swimmer William, 32, (he played water polo at college) has been snorkeling in the crystal clear seas.

Meanwhile, 7-months pregnant Kate, 33, identified by fashion bloggers as wearing a loose-fitting shirt dress decorated with blue shells by local designer Lotty B, strolled with baby George, 18 months and nanny Maria Borrallo.

For William, who has been said by royals writer Ingrid Seward to be making “his own rules” with the blessing of the Queen rather than adhering strictly to royal formality, it is completely natural to involve the Middletons in many things that the couple does.

At his engagement announcement press conference in November 2010, he praised their support, saying, “Mike and Carole have been really loving and caring and really fun.”

William also rode his motorbike to stay with them at their home for weekends during the tough days of army training at Sandhurst Military Academy.

The Middletons provided a welcome respite at their Bucklebury manor house for the first weeks of George’s life. And William and Kate hosted the family for the Christmas holidays at their country home, Anmer Hall, on the Sandringham estate in Norfolk.

The hard-working, middle-class Middletons, whose party favors company, Party Pieces, has made them wealthy enough to afford an estate in Bucklebury and to send their children to the prestigious Marlborough College, are the perfect antidote for William to the often-stuffy royal world, insiders say.

“William is a very approachable person and likes normality and as a result of which likes nothing better than spending a bit of time with her family,” a friend says.

This year’s Caribbean vacation has also had a special focus for the family. Carole, who marked her 60th birthday on the island, celebrated with a “small and discreet” bash, actor John Cleese Tweeted.

The royals will return in the coming days, with William set to hit the books and continue with his studies for his air ambulance job. He has taken and passed three quarters of the 14 exams in his bid for his commercial pilot’s license. Palace sources expect him to be ready after the exams and further training to start working as a pilot in early summer.

Kate has some royal engagements, including a visit to Portsmouth next week, coming up as she continues her public duties entering her third trimeseter.