Jack Schlossberg has pointed thoughts about his cousin-in-law Cheryl Hines. "I have never met Cheryl Hines, but if I did, I'd tell her she looks super dehydrated," Schlossberg, 32, quipped via X on Wednesday, July 23. Jack is the son of Caroline Kennedy and her husband, Edwin Schlossberg, making him the only grandson of late President John F. Kennedy. (JFK and wife Jackie Kennedy Onassis were parents to children Caroline and John F. Kennedy Jr.) Hines, 59, has not addressed Jack's claims. Us Weekly has reached out for comment. Cheryl Hines and Robert F. Kennedy Jr.