Rob Reiner's son Nick Reiner had "always been hostile and volatile" toward his family before he was arrested over claims he murdered his parents, sources exclusively tell Us Weekly. "Nick's problems have been going on for so long, so while everyone is in a state of shock right now, it's not entirely surprising," sources close to the situation tell Us. "A lot of his anger was directed at his parents for many, many years," the insider explained. "They did everything a parent could possibly do to help him. Even in his younger years, they really tried to get him help.