I read it years ago in the newspaper–not the greatest source for science info–that blood relatives of people with depression are more creative. It kind of makes sense: If nerve connections suddenly switching into a new arrangement is the physical manifestation of insight, someone whose brain does that more easily would be more creative. A very flexible brain might also be more likely to switch into an abnormal configuration. You’ll never forget your kid sister Grogina who jumped off the Great Cliff. The loss became more bearable after that time you figured out how to get past that hungry lion, the story of which making hot, fertile cave babes swoon into your arms ever since.
Again: years ago, newspaper. Just a thought.