AS a young man William can never have imagined himself paying homage to his father in Westminster Abbey.
But there he was kissing him on the cheek and watching the King’s eyes well up with emotion.
The following evening he paid a moving tribute to his "ancient" dad as part of the Coronation concert.
It was completely genuine and heartfelt, and when William returned to the Royal Box, the King was again clearly moved. So was the audience.
Last September, a day after the loss of his mother the Queen, Charles announced "he was proud" to create William 'Prince of Wales', and how he would be taking over "some of the titles that have meant so much" to him throughout his life.
Proud and pride are two words both father and son have been using over the last few days, but there was a time a few years ago William would avoid his father.
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And when they did speak, it was usually to disagree.
Charles found William difficult to deal with as they both have a short fuse.
Their infrequent telephone calls were often heated discussions as father and son clashed over their differing opinions.
William was not afraid to speak out and say he found some of his father’s ideas distinctly old fashioned and impractical.