I think I read that he had this done and when it was over, he told his wife. IIRC, she was quite upset.
I read the same thing in a bio once.
Joe Kennedy must have feared Rosemary had inherited his immoral sexual genes when you consider the reasons he gave for having her lobotomized. He certainly didn't seem to mind that his adulterous lifestyle might have an effect on his family. From reports, he and Gloria Swanson did not hide their affair, and she was even on the same ship sailing to Europe with the family. His sons, unfortunately, did take after him, and their wives suffered the humiliation of being married to the philandering Kennedy's. The MSM wouldn't dare tell the public the truth...it might make people in Massachusetts face reality and have to acknowledge what a louse Ted Kennedy really is.