Kate Middleton is reportedly facing mounting public expectation as the future queen consort. The Duchess of Cambridge, 38, is married to Prince William, also 38, who is second in line to the British throne.The couple share three children: Prince George, 6, Princess Charlotte, 5, and Prince Louis, 2. “Those who know her say there is a real core of strength, and she did set her mind to the job,” Sarah Gristwood, author of “Elizabeth: The Queen and the Crown,” told People magazine on Wednesday. “But at the same time, she’d had to be superhuman not to feel the pressure,” added Gristwood.