Essays that contain a lot of details on how your mother/father/sibling/pet/relative was diagnosed with cancer or some disease, and how you “grew” as a result or what you learned are also fairly overused and, if not done correctly, tend to focus more on your relative or sibling than it does yourself.
Of course, it you execute it well, then it may turn into a good topic.
As AngryCarp said, the best solution is to simply answer the prompt and answer exactly what it asks.