Kate Middleton’s relationship with Prince William was life-changing not only for her, but also for her entire family. In his new memoir, “Meet Ella: The Dog Who Saved My Life,” Kate’s brother, James Middleton,

Kate Middleton's life radically changed when she became the Princess of Wales, but she and her siblings made a sweet pact after her engagement to William.

James Middleton, Princess Kate's brother, has released his first book, in which he discusses everything from his interactions with Queen Elizabeth to his beloved dogs. Meet Ella: The Dog Who Saved My Life also frankly talks about James' experiences with depression, and how his sisters, Kate and Pippa Middleton, helped him.