Kate Middleton playfully adjusts Princess Charlotte's hair at Trooping the Colour event.

Royal fans have observed a playful interaction between Kate Middleton and Princess Charlotte at the Trooping the Colour event, with Kate repeatedly adjusting her daughter's hair. This has led to speculation about a possible "Royal" rule or simply a mother's instinct to ensure proper appearance. Kate and Prince William reportedly use a "sofa chat" approach to discipline their children without shouting.