One more thing about Mental Illness. Many people with mental illnesses will also do things that are what society considers not normal. It maybe abusing drugs and alcohol, emotionally & physically abusing a spouse or their own kids.
Some people are really good at hiding their illness. We look praise people in business and entertainment for their accomplishments and success bringing joy to people, we put them on a pedestal. But behind closed doors their is a different person that the world doesn't see, the family see's something different. It's a person they don't want the world to see for fear of losing it all.
Robin Williams is a perfect example. Many people were shocked, surprised at his sudden death. I was shocked but not surprised.