To answer this, make sure that you understand the question. The Joads are faced with many hard times and tough situations throughout this book. In general, people tend to focus on themselves and only worry about their own safety and well-being. However, during the many difficult events that take place, the Joads bond together as a family and work for a common goal. What are examples of this? If you show examples of certain instances when one family member helped another, or when they all joined together to accomplish something, then this will be illustrating how they demonstrated the "movement from 'I' to 'we'.