In "The King's Birthday: Charles At 75", viewers are invited to explore the complex and intriguing relationship between Queen Elizabeth II and her eldest son, Prince Charles. Through a chronological journey, the episode delves into significant moments in both their lives, offering insights into their personal and public experiences. From pivotal moments such as the queen's coronation when Charles was just three years old to the challenges faced during his divorce from Diana, Princess of Wales, the episode provides a comprehensive look at the bond between mother and son. Viewers can expect to gain a deeper understanding of the dynamics within the royal family and the enduring influence of Queen Elizabeth II on Prince Charles' life and reign.