I don't know that I'd even consider JK Rowling's story a 'sob story'. Her parents died while she was an adult and she happened to find herself in a situation where she was terribly, terribly poor. Usually sob stories are like "I have cancer and so does my dog, but my husband left me and singing is how I get through the day" or "my husband is in Iraq and I'm raising his four children because I couldn't keep it in my pants. He hasn't even met the youngest, Bessy"
Then again I guess hers would be a sob story... maybe it's just the matter-of-fact way she tells it that makes it seem otherwise lol