The heir to the throne has told a new BBC documentary that he spoke with Philip over the phone on April 8 and tried to talk to him about his 100th birthday celebrations.
Charles broached the subject with some reservation as he knew his father wasn't keen on a big celebration. 'We're talking about your birthday,' he said before repeating himself more loudly due to Philip's slight hearing difficulties.
'We're talking about your birthday! And whether there's going to be reception!' Charles said.
'Well, I've got to be alive for it, haven't I?' Philip shot back, in typically dry fashion.
'I knew you'd say that!' Charles responded in what is thought to have been their last conversation together.
The exchange was recounted by Charles as part of Prince Philip: The Royal Family Remembers, a programme due to air on BBC One on Wednesday night.
The film features new interviews with all of Philip's children and adult grandchildren, including William and Harry.
The Daily Mail has exclusively seen the film and reported it features several senior royals sharing their fondest – and funniest – memories of the duke, who died on April 9 aged 99.
Prince William tells how, while they were out together in a remote spot on the Balmoral estate, the pair came across a group of young walkers who were taking part in an activity for their Duke of Edinburgh awards, which was founded by Philip.
William recalls: 'He stopped and wound down his window and said, "Good morning. How are you getting on?" To which the smallest young chap at the back turned round and effectively said, "Jog on Grandpa!"
Philip found it hilarious, according to William. He wound the window back up and turned to his grandson and said: 'The youth of today!'
Sharing his memories, Harry, who quit his position in the family last year, says his grandfather was always 'unapologetically him'.
Speaking from his home in California, where he now lives with wife Meghan and children Archie and Lilibet, he said: 'From my grandmother's perspective, to have someone like that on your shoulder for 73 years of marriage – it doesn't get better than that.'
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