Kate's brother shares childhood photo and says family will 'climb mountain' together

The Princess of Wales's brother James Middleton has paid tribute to his sister, sharing a picture of the two of them together as children on social media.

In a message posted on Instagram, he said the family would rally round Kate.

"Over the years, we have climbed many mountains together. As a family, we will climb this one with you too," he wrote on the social media site.

James Middleton is the younger brother of Kate and their sister, Pippa.

His message was posted shortly after the princess's announcement that she has been diagnosed with cancer and is undergoing preventative chemotherapy.

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