Prince William Shelters Kate Middleton with Umbrella on Walk to Christmas Service

The Duke of Cambridge was later seen speaking to his father Prince Charles, with both prepared for all weathers by clutching umbrellas.

In the documentary, “When Ant and Dec Met The Prince: 40 Years of the Prince’s Trust”, William, 33, and Harry, 31, fondly revealed how Charles, 67, used to embarrass them at school by laughing in all the wrong places, according to Event Magazine, which previewed the 90-minute film.

In the interview, Prince William told Anthony McPartlin and Declan Donnelly that his father once had a laugh when there was a malfunction with special effects at a play he was in at school.

The royals attended Sunday service at Sandringham church yesterday on the Queen’s estate, and the Duchess of Cambridge, wearing a fashionable tweed suit, shade boots and a navy floral felt hat, was greeted with flowers from well-wishers as she walked to the chapel with members of the royal family. The Prince’s Trust provides training and skills for disadvantaged young people.

The celebrity duo whom the princes spoke to – Ant and Dec – are Prince’s Trust Ambassadors and made the documentary about the Prince of Wales’s charity.

William and Harry also described how their father will write vast numbers of letters by hand during the day, but say his writing gets harder to read as they day goes on due to him getting exhausted.

Princes William and Harry call their dad “incredibly hardworking” in the documentary. ― Reuters picLONDON, Dec 28 ― Prince Charles certainly looks to be revering his role as grandfather to Prince George and Princess Charlotte, with him revealing how he grateful he is to have them because they can care for him in old age. In it, he admits that he has yet to change one of his grandchildren’s nappies, but takes comfort in the fact they will be around “to look after me when I am doddering about”.