James Middelton, the younger brother of Kate Middleton has opened up on how he showed his sister support throughout her battle of cancer. James Middleton is opening up. James is the younger brother of Kate Middleton, and their sister Pippa Middleton. The brother of the princess is releasing a memoir, Meet Ella: The Dog Who Saved My Life, next week. Fans are getting a rare glimpse into his life, and the things he has been through. After being diagnosed with clinical depression, ADD and dyslexia, the younger Middleton has been pouring all of his energy into James and Ella, his company dedicated …