Article continues below advertisementOK! can reveal Prince Harry once described Kate Middleton as "the big sister he never had" - in a strikingly sentimental six-word tribute that has resurfaced as his bitter feud with Prince William shows little sign of easing.Harry, 41, made the remark years before his relationship with William, 43, and Kate, 44, the Princess of Wales, deteriorated following his departure from royal duties in 2020 and the publication of his memoir Spare in 2023.