When we look at Prince Charles, we see a future king, a humanitarian, a son to Queen Elizabeth and a husband to Camilla.

But one of his roles that is perhaps is not talked about enough is grandfather.

Between him and his wife Camilla, the 69-year-old has eight grandchildren and step-grandchildren, and it was recently revealed that Charles plays the part very well indeed and is well-loved by all of the young children.

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A new BBC documentary about his life saw The Duchess of Cornwall take the opportunity to heap praise upon her husband of 13 years, revealing that the "adored" grandpa often reads Harry Potter to George, Charlotte and Louis - and makes sure to do all of the voices.

She said: "He will get down on his knees and crawl about with them for hours, you know making funny noises and laughing and my grandchildren adore him, absolutely adore him. He reads Harry Potter and he can do all the different voices and I think children really appreciate that."

In addition, viewers of the programme - named 'Prince, Son and Heir: Charles at 70' - got a further insight into the heir to the throne's relationship with his family, with his son Prince William revealing that he'd like his dad to see his grandchildren more.

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When asked whether his workaholic father has "time to be a grandfather on top of everything else", William told his interviewer that it was something he was "working on", but added that Charles was "brilliant" when he did visit.

"It's something I'm working more heavily on, put it that way," the Duke of Cambridge explained. "I think he does have time for it, but I would like him to have more time with the children. Now he's reached his 70th year it's a perfect time to consolidate a little bit because, as most families would do, you are worried about having them around and making sure their health's OK – and he's the fittest man I know but equally I want him to be fit until he's 95."

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He continued: "So having more time with him at home would be lovely, and being able to play around with the grandchildren. 'Because when he's there, he's brilliant. But we need him there as much as possible."

Charles is rumoured to have privately expressed his frustration that he doesn't get to see as much of his grandchildren as the Middleton family. This claim has always been dismissed by his aides, but William's answer is bound to be closely analysed by viewers.

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The documentary, which is designed to celebrate the prince as he turns 70 on November 14, also sees Charles discuss his role as an activist, with the 69-year-old admitting that he would have to stop campaigning in public when he took the throne, stating "I'm not that stupid".

It also will contain warm tributes from family members including his wife, who describes him as an exceptional man" whose kindness isn't always recognised by the public.

Prince, Son and Heir: Charles at 70 airs in the UK on BBC1 tonight at 9pm.

Prince Charles reads 'Harry Potter' to George, Charlotte and Louis and does all the voices