"Not two", he says.
"But the idea somehow that I'm going to go on exactly the same way if I have to succeed is complete nonsense because the two. the two situations are completely different". I suspect quite a few of you may too have grandchildren or will do soon.
Lord Hain added: 'I've never been a monarchist, but if you believe in a monarchy, then I don't see why the monarch now or the future monarch should be expected to be completely view-less and silent on everything'.
But he told the BBC that he would operate within "constitutional parameters" as king. "But it's a different function". "But afterward watching it on the television, I think it was a lovely gesture".
He has campaigned on issues such as the environment for decades, but says he would not do the same as monarch.
But when the interviewer suggests that some people are concerned his involvement will continue in the same way, Prince Charles becomes more animated, and replies in a direct way, saying: "No, it won't". I'm not that stupid, I do realise that it is a separate exercise being sovereign. "I think people by now would have been rather fed up if I hadn't, I would have thought", he said. "So, of course, you know, I understand entirely how that should operate".
"I do fervently pray that you'll all do your utmost to work together in the coming year to make real, substantial progress", he said.
In fact, one royal correspondent claims Charles' kids are "control freaks" about their coverage, and says that Kate and William in particular are known for purposefully not looking at a "fixed point" when having their picture taken-making it hard for photographers to get good images of them.
While he did note the arrival of Prince Harry's child, he and his wife, Camilla, seem to be the most wonderful grandparents to the three grandchildren he already has; Prince George, Princess Charlotte and Prince Louis. Appealing to Charles to slow down, he says: "I would like him to have more time with the children".
Harry adds that it was never a question in his mind that his father would be there for him at such a crucial time. Because when he's there, he's brilliant.
Prince, Son and Heir: Charles at 70 airs tonight on BBC One at 9pm.