Paternal instinct?

The man's methods...positively stepfatherly...

"'Rosemary Kennedy, the third of Joseph P. Kennedy and Rose's nine children, was one of the most striking of all the Kennedy daughters. Yet in Rosemary: The Hidden Kennedy Daughter, excerpted in this week's PEOPLE, author Kate Clifford Larson depicts a vivacious and curvy beauty with a 'perfect smile' who was always on a diet to please her strict parents.

Once, after she put on a few pounds during the winter months, Rosemary, who was intellectually disabled, wrote to her father from boarding school, knowing he disapproved. 'I am so fond of you,' she wrote in her childish script. 'Sorry. to think that I am fat. you. think.' Joe responded to the school: 'She is getting all together too fat and I told her in no uncertain terms.'"

~Inside Rosemary Kennedy's obsession....