Charles Spencer recently got royal watchers talking earlier this week when he opened up about whether he would be attending King Charles' upcoming coronation as part of a podcast appearance.On Sunday, the Earl appeared on BBC Radio 4's radio show and podcast Broadcasting House, where he gave a sweet glimpse into his family life.As part of a discussion about the weekend's newspapers, Charles revealed why his youngest daughter, Charlotte Diana, 11, had made him proud.WATCH: Charles Spencer's family home revealedCharles and a panel of guests were discussing the topic of whether books should be changed to exclude controversial content, and whether it had become more difficult to choose appropriate characters for children to dress up as for World Book Day.The father-of-seven commented: "It's always so difficult, there used to be endless people dressed as Harry Potter characters but that's no longer the case."I was very proud of my daughter going last year as the Moon Child in The Never-Ending Story, I thought that was pretty good". He then revealed: "This year, she'll be going with her best friend as Tweedledee and Tweedledum".