touching state funeral for Queen Elizabeth II was missing two important guests. Though Prince Harry and Meghan Markle were both in attendance, with the Duke of Sussex participating in several processionals surrounding the historic day, neither their 3-year-old son, Archie, nor their 1-year-old daughter, Lilibet, joined their parents for any of the events surrounding the death of their great-grandmother.The two youngsters, who are sixth and seventh in line to the British royal throne behind their father, were home in Montecito, California, while their parents were in the United Kingdom. ET has learned that the Duke and Duchess of Sussex plan to return to California imminently to be reunited with their children. On Monday, royal expert Katie Nicholl told ET's Kevin Frazier in London, «I think we'll probably see the Sussexes on their way back to America very soon.