Good Morning Britain welcomed Britain's biggest family on Tuesday, and they were quizzed on the Duke and Duchess' decision to only have two kids.
Prince Harry recently revealed he is set on only having one more child with Meghan Markle alongside Prince Archie in order to do their bit for the planet.
However, Noel and Sue Radford, who have 21 children together, suggested that there was more the royals could do if they were intent on limiting the size of their family.
When discussing the issue with Ben Shepherd, Noel responded: "I think that's fair enough if he only wants to have two, not everyone wants a big family like us do they?
"But I think if he's using the excuse that he wants to save the planet, he's got his big private jets and his big luxury home, his heating and lighting."
The family were also quizzed on how they got by as such a big unit, with the parents admitting that they loved having a big family, but sometimes holidays got a bit hectic.
Following the show many viewers took to social media to praise the family.
One viewer said: "Lovely family with lovely well brought up children."
Another commented: "This mum & Dad are amazing thank you for sharing your story 21 beautiful children."
A third tweeted: "We have nine children, 21 Wow !! Well done to you."
In an interview with 85-year-old ethologist Dr Jane Goodall, the Duke Of Sussex spoke about climate change and his ambitions to have another child with wife Meghan Markle.
The full interview between the pair will be published in September's issue of British Vogue, with it being guest edited by the Duchess of Sussex.
In the discussion, Harry said: "I think, weirdly, because of the people that I’ve met and the places that I’ve been fortunate enough to go to, I’ve always had a connection and a love for nature. I view it differently now, without question.
"I’ve always wanted to try and ensure that, even before having a child and hoping to have children..."
Dr Goodall then jumped in - saying she hoped the parents wouldn't have 'too many' children, to which Harry replied: "Two, maximum!"
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