Britain's Prince William, Prince of Wales, leaves Westminster Abbey after the Coronation Ceremonies of King Charles III and Queen Camilla in central London on May 6, 2023.

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London CNN  — 

There is never a good time to find out a parent has cancer. It’s a particularly difficult moment for Prince William.

His father’s cancer diagnosis comes as the heir to the British throne was already navigating a health scare at home. It was only last month that his wife Catherine had abdominal surgery that will sideline her for several months.

Little is known about the Princess of Wales’ procedure, but her lengthy recovery signals a serious operation. With three young children to care for, William’s diary was also cleared. His priority abundantly clear: Family comes first.

With Charles’ candid disclosure, those plans are evolving. William is now unexpectedly needed to pick up some of his father’s public-facing responsibilities, given he’s the next-in-line. He’s been thrust into a role that not too long ago Charles was doing for the late Queen Elizabeth II – stepping in as needed while the monarch was temporarily unavailable.

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See Prince William's first public appearance since King Charles' cancer diagnosis
01:23 - Source: CNN

The demands of being the immediate heir saw William make a partial return to royal duties on Wednesday after a three-week absence. He kicked things off by hosting an investiture ceremony at Windsor Castle. Dressed in his RAF uniform, he smiled warmly, charming guests while doling out honors on his father’s behalf.

The prince has “an unwavering commitment to duty and service,” a royal source told CNN, adding that “investitures are an important part of his royal role, celebrating people up and down the country doing incredible things for their communities.”

Later, he attended a gala dinner in central London as the patron of the London Air Ambulance, where he publicly addressed the royal double health scare for the first time.

“I’d like to take this opportunity to say thank you, also, for the kind messages of support for Catherine and for my father, especially in recent days. It means a great deal to us all,” William said.

He then quipped: “It’s fair to say the past few weeks have had a rather ‘medical’ focus. So, I thought I’d come to an air ambulance function to get away from it all.”

William chats with with Air Ambulance pilots, doctors and paramedics on Wednesday evening.

Beyond those two engagements, there is nothing else scheduled for him in the days ahead. That could partly be down to a school break next week but also because the 41-year-old royal is continuing to make his family his focus.

Charles, who flew to his Sandringham home after a blink-and-you-miss-it reunion with Prince Harry on Tuesday, is still handling state matters while going through his unspecified treatments. That will give William some flexibility as it means the prince appears not to be needed to pick up any constitutional business. But that will be something his staff are carefully coordinating with Buckingham Palace.

While it could be some time before we next see him, the Prince of Wales will likely be called on to lead the family for the annual Commonwealth Day service – a staple celebration in the royal calendar that will be held at Westminster Abbey on March 11.

The developments this week will have been an eye-opener for