Prince William, Kate Middleton and other members of the royal family were all traveling on the day Lilibet was celebrating her first birthday at home, but it wasn't to avoid it.A source tells ET, the Duke and Duchess of Cambridge and other members of the royal family that included Duchess Sophie and Prince Edward all traveled to different parts of the UK to visit those who are celebrating Queen Elizabeth's Platinum Jubilee. The source is adamant the events were not planned to avoid Lilibet's birthday at home.«It's simply a coincidence they fell on the same day,» the source said.