King Charles left in tears by Prince William

King Charles III has made shock admission about his eldest son Prince William's words that left him with tears.

The Prince of Wales, who shares an incredible bond with his dad, once moved the monarch to tears with his comments.

75-year-old Charles knows his eldest son William, who's one step closer to become King, is protecting the monarchy, and will one day follow him onto the throne.

During ITV documentary "Prince Charles: Inside the Duchy of Cornwall",  William and Harry's father opened up like never before. They filmed at the Royal estate which he has built up over the last 50 years into a billion pound business to support himself.

William, in chat with a second-generational farmer Mervyn Keeling about his private estate, said: "I’ve started to think about how I will inherit the Duchy one day and what I do with it. I think it’s really important, the family angle, I really do."

Watchers were then shown a clip of King Charles, who reflected on the conversation between his son and the farmer.

The King revealed: "When I saw it, I couldn’t believe it. I was deeply touched and moved by what he said. Frankly, it reduced me to tears. It did, really. Because, I suddenly thought, well, just hearing that from him has made the last 50 years worthwhile."

Royal commentator Camilla Tominey told The Telegraph: "The warmth which so obviously zings between father and son seems to signify a laying to rest of the ghosts of William’s childhood and any soreness he has felt towards his father after witnessing the traumatic fallout of his parents’ separation as a 10-year-old boy."

William's wife Kate Middleton was reportedly been instrumental in bringing the two closer together. Catherine has made sure Charles is present for their children’s birthdays and key moments.