You can try and count how many times William and Harry say they are proud of their dad in the documentary, but you'll lose track fairly quickly. From speaking about their admiration for his work setting up the Prince's Trust to their praise for how he had identified social problems that no one else was talking about, it's clear that the Duke of Cambridge and Duke of Sussex think their Dad is the bee's knees. They spoke of his "big heart" and his work ethic and made no secret of the fact that to them, Charles is the ultimate royal and the best possible father.
Image Source: Getty/ Mike Marsland