Prince Harry's relationship with Prince William isn't the only dynamic that has changed over the years. The Duke of Sussex's bond with his sister-in-law, Princess Kate, has gone through its own changes following his and Meghan Markle's royal exit. While Harry always had kind words for his sister-in-law - "I've known Kate for years, and it's fantastic that she is becoming part of the family," he gushed after William and Kate's engagement in 2010 - their relationship grew rockier as he publicly spoke out about their estrangement.