The royals are "very much not a racist family" said the British prince, following comments made by his brother Harry and sister-in-law Meghan to US talk show host Oprah Winfrey.
Meghan told Winfrey that Harry had been asked by an unnamed family member "how dark" their son's skin might be.
Buckingham Palace sought to respond to the allegations in a 61-word statement Tuesday, but it has failed to quell the controversy.
William and Harry's relationship
William said he had not talked to Harry since the interview but he said planned on doing so.
During the interview, Harry said there was "space" in his relationship with William.
"I love William to bits, he's my brother, we've been through hell together and we have a shared experience," he said. "But we're on different paths."
William and Kate toured School21 in Stratford, east London as children returned to classes, following lifting of some coronavirus restrictions.
The visit was also meant to mark the rollout to secondary schools of a mental health project Kate launched in primary schools in 2018.
Top scandals involving British royals
Fans of the British royal family are also in love with their scandals. Prince Harry and Meghan's interview is one recent case, but there have been many preceding it.
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A model for Harry and Meghan?
Their love moved the world: King Edward VIII was unable to marry the divorced American Wallis Simpson because he was the head of the Anglican Church and so decided to step down from the throne after only 326 days. The couple did get married, on June 3, 1937 at the Cande castle in France. The scandal rocked the royal household.
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Princess Margaret's divorce
Queen Elizabeth's youngest sister was one of the most glamorous members of the royal family: She loved parties, alcohol and had affairs. She had two children with her husband, the Earl of Snowdon. The couple separated in March 1976, making Margaret the first royal to divorce — after Henry VIII in the 16th century.
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Snapshots from married life
Not everyone believes that the riding teacher James Hewitt was Lady Diana's first extra-marital lover. There is another rumor that she had an affair with her bodyguard, Barry Mannakee in the 1980s. When Prince Charles confessed to having cheated on her, Lady Diana also admitted having a relationship with Hewitt. Could he be Prince Harry's biological father?
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Charles and the tampon affair
Prince Charles is shown here leading his second wife Camilla Parker Bowles to the altar. His first marriage with Lady Diana had failed. Their fights exposed intimate secrets, including a flirty telephone conversation between Charles and Camilla, which became known as "Tampongate," as it revealed one of the prince's most cringeworthy fantasies.
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The Queen's silence
A year after her official divorce from Prince Charles, Diana and her boyfriend Dodi Al-Fayed died in a car crash, leaving Britain in shock. Yet it took a long time for the Queen to react with a word of sympathy. Her silence was met with huge criticism; every fourth Brit advocated the abolition of the monarchy. Only days later did the royals reach out to the grieving people.
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'Harry the Nazi'
Drugs, alcohol and parties earned the prince the nickname, "Dirty Harry." Once, he also managed to get caught stark naked at a Las Vegas party by the tabloids. And a picture of the 20-year-old royal dressed as Nazi officer Erwin Rommel, complete with the swastika, was lapped up by the press.
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Prince Andrew and Jeffrey Epstein
Could Prince Andrew, Queen Elizabeth's second son and the ex-husband of Sarah Ferguson, be involved in sex scandals related to Jeffrey Epstein? The American investment banker is believed to have run a sex-trafficking operation with minor girls. Epstein committed suicide before his trial began.
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The bombshell
Around 50 million people watched Oprah Winfrey's interview with Prince Harry and Meghan. The two revealed serious allegations against the British royal family and also accused them of being racist. When Meghan was pregnant with her son Archie, she said there were "concerns and conversations about how dark his skin might be when he is born."
Image: Harpo Productions/Joe Pugliese/REUTERS
The Queen breaks her silence
In the meantime, Buckingham palace has said that the Queen is taking the accusations of racism "very seriously." In a statement issued on her behalf, the palace announced that the royal family was "saddened to learn the full extent of how challenging the last few years have been for Harry and Meghan," adding that the accusations by Meghan and Harry would be dealt with privately.