A new biography by royal expert Ingrid Seward looks at the life 99-year-old Prince Philip, the Duke of Edinburgh. Talking with CBS News foreign correspondent Roxana Saberi, Seward shares how Philip worked to modernize the English monarchy and his role as father to Prince Charles and Andrew. Hear how his relationship with the late Princess Diana deteriorated over time and what he thinks about Prince Harry and Meghan Markle stepping away from royal duties. "Prince Philip Revealed" is published by Atria a division of Simon and Schuster.