The New Royals,” on the reasons why Kate Middleton blossomed in an aristocratic environment — while sister-in-law Meghan Markle chose to resign her royal duties with husband Prince Harry and relocate to the US.Middleton, 40 has officially been a part of the royal family since she wedded Prince William, 40, in April 2011. Throughout their decade of marriage, the Princess of Wales solidified her place as a significant member of the Firm. Markle, 41, on the other hand, has had a rougher go of royal life.