I knew the Kennedy family was, shall we say, dysfunctional, but I had no idea their father was that bad. But even so, Joseph Kennedy held a pretty firm grip on his kids even once JFK became President. It's my understanding that John didn't even want to make Bobby his Attorney General, but their father demanded it and he simply gave in. However, if JFK did muster the courage to stand up to his father so to the point of having him lobotomized, he'd need good reason for it. Otherwise, it'll be a scandal of epic proportions (assuming it becomes public knowledge). I can't imagine a situation where the general public (perhaps aside from some women, who sympathize with Rosemary) would be alright with a sitting President up and demanding his father be completely incapacitated. And if he's not careful in how he goes about it, I could see some even arguing for impeachment on grounds of abuse of power.