Prince Archie (7) and Princess Lilibet (5) are about to enter a new phase of life: after the surprising return of their parents Prince Harry (41) and Duchess Meghan (45) to Great Britain, the brothers and sisters are due to attend a British school for the first time this month. As Page Six reports, Archie and Lilibet are to attend a private school whose name and location are not publicly disclosed for security and data protection reasons. Obviou…