Six years after finishing his second term as the president of the United States, Ronald Reagan was diagnosed with Alzheimer's -- a devastating neurological disease that impairs memory, judgment and reasoning. But the former president's son, Ron Reagan, says he saw the early signs of Alzheimer's while his father was still in office.
"It wasn't anything that obvious. It wasn't like, 'Oh my God, he doesn't remember he's president,' Ron Reagan said in an exclusive interview with ABC News. "It was...Full Story