The 74-year-old Grace and Frankie actor added that he just tried to be there for Charlie as best he could during that difficult time. "You try to be as present as possible. But you have to be aware of the circumstances," he said. "You have to be aware of many things that the public is not aware of."
He also shared that his son was battling addiction when he had his meltdown. "He was in a very desperate situation," Martin recalled. "And he was doing what he felt would get him out of it – going public. And it was very painful. No less painful for him."