After announcing their engagement in 1981, Prince Charles and Princess Diana were married. Hulton Archive/Getty ImagesPrince Charles is rumored to be absent from the unveiling of the statue of Princess Diana on Thursday.According to reports, the prince has plans for a trip to Scotland and does not intend to visit Prince Harry.Harry traveled from Santa Barbara, California to attend the ceremony.For more stories, visit Insider's homepage.Prince Harry and Prince William are expected to attend the unveiling ceremony of the statue that they commissioned for Princess Diana on Thursday. It will have been her 60th Birthday.Insider has been provided details by Kensington Palace, including the guest list. Apart from William and Harry the only ones expected to attend the event are members of the statue committee, Ian Rank-Broadley the sculptor, and Pip Morrison the garden designer.The Prince of Wales, Diana's ex-husband, is not included in the list.According to The Sun, Prince Charles will not be attending the ceremony as he has a trip planned to Scotland."Charles will leave it to the boys. An anonymous source said Harry would need to be quarantined for at least five consecutive days once he arrives in England. This will most likely take place at Frogmore Cottage, Windsor."Charles has made it clear that he won't be there beyond that, because he is going on to Scotland. The source said that there is no plan to meet the three of them."An anonymous source claims to have been a friend of Prince Charles and said that he finds it difficult. These moments can bring back old wounds and memories.The event will be held at Kensington Palace, where Diana lived with William and Harry.Charles and Diana were married 15 years. They split in 1992, but continued to perform royal duties separately until eventually divorcing in 1996.Charles confessed to an affair in 1994 during a TV interview. He said he was faithful until the relationship "became irretrievably destroyed, both of us having tried."Continue the storyAlong with William, Harry and Prince Philip, the prince walked behind Diana’s coffin along with Earl Spencer, Diana's brother and Earl Spencer. In 2004, he also attended the opening ceremony of Diana's memorial fountain at Hyde Park.Harry traveled from Santa Barbara, California to be there for the ceremony.Andrew Morton, Princess Diana's biographer, previously stated to Insider that Harry still has a lot of work to do before he can reconcile with his father and Prince William.Morton stated, "You don’t say your brother’s trapped and your dad’s trapped in that institution, which was your birth into, and expect everybody to be all sweetness." Morton made the comment referring to comments made by the Duke during Oprah Winfrey's March interview.It is not known what status Charles and the Duke of Sussex are in their relationship. They were last seen together in April at Prince Philip's funeral, their first meeting since Harry and Markle's interview on Oprah.Clarence House did no immediate respond to Insider's request.Insider has the original article.