"I remind them that there are two grandmothers - there were two grandmothers - in their lives”

Prince William makes heart-warming Prince George and Princess Charlotte Diana confession in candid new documentary about Princess Diana’s life…

Prince George and Princess Charlotte are blessed with being surrounded by a large and loving family. As well as their much loved grandparents, Michael and Carole Middleton, who regularly look after the children and are incredibly present in their lives, the Prince and Princess also have the extended royal family surrounding them.

From their young cousins who make the perfect playmates, to their doting ‘Gan Gan’ great-grandmother who leaves treats on their pillows when they stay at Kensington Palace, George and Charlotte aren’t short of loving family members.

READ MORE: All the times Princess Charlotte was just like the Queen!

However, there is one very special family member who the two siblings will never meet. Princess Diana, who passed away 20 years ago next month in a tragic car accident in Paris, would have been a loving and doting grandma to Prince William’s two children.

READ MORE: William & Harry remember their mother Diana in emotional new documentary

In a new documentary about her life, due to air on ITV this evening, Prince William has opened up about how he tries to keep his mother’s memory alive but teaching his two children about ‘Granny Diana’.

Confessing that he thinks Diana would have been an “absolute nightmare” as a grandmother, Prince William also admits that he knows the responsibility of teaching his two children about his late mother is his alone, and not something Kate can help him with.

“It’s hard because obviously Catherine didn’t know her, so she cannot really provide that level of detail,” he said.

“So I do regularly put George or Charlotte to bed, talk about her and just try and remind them that there are two grandmothers – there were two grandmothers – in their lives.”

prince george and princess charlotte dianaREAD MORE: The Duke & Duchess of Cambridge will re-dedicate Diana’s grave with Harry

Remembering his mother’s fun and ‘naughty’ nature fondly, William jokes, “She’d be a nightmare grandmother, absolute nightmare. She’d love the children to bits, but she’d be an absolute nightmare.”

“She’d come and go and she’d come in probably at bath time, cause an amazing amount of scene, bubbles everywhere, bathwater all over the place and then leave.

William also admitted that he talks about “Granny Diana” with Prince George and Princess Charlotte “constantly.”

“I want to make as much time and effort with Charlotte and George as I can because I realise that these early years particularly are crucial for children, and having seen, you know, what she did for us.”

You can watch the documentary, ‘Diana, Our Mother: Her Life and Legacy’, on Monday 24th July at 9pm on ITV. Also, the programme will be available on ITV player following broadcast.