True Origin of the Kennedy Curse?

I have to write a report on the origin of the Kennedy Curse. When I search for it I only find the theory that it was because of JFK's father's bootlegging. No offense to those who believe that, but that is a stupid theory. I myself believe that it was because they gave Rosemary Kennedy a labotomy to help JFK's career. Does anyone have a souce with an author that I can use for the report which says that it was Rosemary who cursed them. Thanks for the help.