This dream may symbolize a desire to revisit and explore your past, particularly your childhood and family history. The old house, possibly belonging to your grandmother, represents a sense of nostalgia and longing for simpler times. The hallway and door at the end may represent a journey towards self-discovery and uncovering hidden aspects of yourself. Your little sister could represent your inner child, and your promise to explore the unknown together may suggest a desire to reconnect with your innocence and curiosity. The shadow moving could symbolize fears or doubts that may arise during this journey. The ghostly sister and the baby in the car seat may represent unresolved emotions or memories from the past that are still affecting you. The old friend at the table could symbolize a part of yourself that you have lost touch with. This dream may be urging you to confront and heal your past in order to move forward in your present life.