Answer: get Berniece to play the piano
Step-by-step explanation:
Berniece doesn´t want to play the piano, which represents their tragic past. She claims to be afraid of awakening the spirits of her ancestors.
But when Sutter’s ghost attacks her brother, she overcomes her fear and releases her ancestors´ spirits by playing the piano to defeat the ghost.
Wilson uses the supernatural element to allow Berniece to stop making excuses for her despair and anguish, so she can bury the past and move on with her life.