Cloie, this dream seems to reflect a mix of loyalty and fear, which might be stemming from the subconscious emotional complexities you have regarding your family and authority figures. The act of hiding your father in the dream suggests a protective instinct and perhaps an internal conflict between upholding familial bonds and confronting issues of morality and justice. The hidden room in your closet, filled with garbage, could symbolize neglected or repressed emotions or aspects of your life that you feel need to be cleaned out or addressed.
Your dream lacks the intensity and negative feelings typical of a nightmare, which might indicate that while the subject matter is serious, it does not cause you significant distress. This could be a manifestation of your mind working through complicated feelings in a way that is not overwhelming for you. The presence of your friend Luke's poster in the secret room might be your mind's way of connecting your current relationships with your deep-seated feelings towards family dynamics.
Looking at your previous dreams, there's a recurring theme of distress and danger, often involving your father. This dream, however, is less about immediate threat and more about concealment and protection. Considering the life events you've experienced, such as the loss of significant people in your life and a history of assault, it's possible that your dream is a continuation of processing past traumas and the ongoing search for safety and control in your life.
The dream may also touch on the fear of discovery and the desire to keep certain aspects of yourself or your history hidden from others. Your subconscious could be expressing the anxiety of maintaining a facade or keeping secrets, possibly related to the experiences you've had and the impact they've had on your views of trust and safety within close relationships.