Jackie Kennedy's grandson Jack Schlossberg has thoughts about Julia Fox paying homage to his late grandmother with a gory Halloween costume. "Julia Fox glorifying political violence is disgusting, desperate and dangerous," Schlossberg, 32, wrote via X on Friday, October 31. "I'm sure her late grandmother would agree." Jack is the only son of Caroline Kennedy and her husband, Edwin Schlossberg, who also share two daughters. Caroline's parents were Jackie and former president John F. Kennedy.