Catherine’s brother also wrote on Instagram that he was “incredibly proud” of his sister, saying it had been an “honour” to have completed the challenge alongside her.
“Two years ago, I told you we’d climb this mountain together,” he said in a post.
“We talked about climbing mountains while you were in hospital, and about the incredible healing power that nature can have for both the body and the mind.”
He continued: “Seeing how far you’ve come is nothing short of inspiring. Your strength, resilience, and determination, all while being the most amazing mother, wife, daughter, and sister, inspire me and so many others every single day.”
After completing the challenge, the princess paid tribute to the charity as “a place that holds great meaning for me and whose care and expertise are life changing for so many people”.
Catherine summitted England’s Scafell Pike, Scotland’s Ben Nevis, and finished on Yr Wyddfa where the reunion was held.