James Middleton has a “close” relationship with Kate and Prince William, a royal commentator exclusively told GB News. The younger brother of the Princess of Wales took to Instagram immediately after Kate, 42, announced she had been battling cancer. The 36-year-old wrote: “Over the years, we have climbed many mountains together. “As a family, we will climb this one with you too.” The Princess of Wales had recorded a video from her garden at Adelaide Cottage to release to the public. In the video, she disclosed her diagnosis saying: “In January, I underwent major abdominal surgery in London and…