How is it possible to prepare for my child's death?

In this episode, Dr. Betters answers the question, "Our son was born with a serious birth defect. The doctors have told us that his time with us will be short and that we need to prepare for his death sometime over the next 6-12 months. How can we wake up everyday and find any joy when we know it might be his last? The fear and pain of this reality is haunting us. We know God has a plan and purpose for everything, but this? Why? What good could come of this? How can we “prepare” for something like this?"