The Palace has confirmed that Prince Charles broke the news of his diagnosis to his sons, and he also spoke to his mother, Queen Elizabeth II.
The senior royals were all last together earlier this month. Charles and his wife, Camilla Parker Bowles, were pictured Queen Elizabeth, Prince William, Kate Middleton, Prince Harry and Meghan Markle, at the Commonwealth Day service in London on March 9.
Prince Charles and Camilla, whose test for the virus was negative, are now self-isolating in Scotland. “Both of them remain in good spirits,” a palace source told PEOPLE. “There is a sense of keeping calm and carrying on.