Dreams about an old house, especially one tied to your childhood and family, often symbolize your past experiences and emotions related to those times. The recurring decay you describe may indicate feelings of nostalgia, unresolved issues, or a sense of loss regarding your childhood or family dynamics.

Here are a few interpretations of the elements in your dream:

1. Old House: This represents your foundation, memories, and possibly unresolved feelings regarding your upbringing. It can reflect how you perceive your past and how it influences your present.
2. Decay: The state of decay suggests neglect or deterioration of past relationships or experiences. It might indicate that there are unresolved issues within your family or feelings that you have not fully addressed.
3. Weeds and Insects: These could symbolize negative feelings or thoughts that have taken root in your life. They may represent worries or concerns that you feel are creeping into your current life, stemming from your past.
4. Broken Windows and Unattached Walls: These elements can signify vulnerability and instability in your current life or emotional state. They may reflect feelings of exposure or fear about what is happening around you.

The fact that the house changes with each dream suggests that your perception or feelings about your past and family dynamics may be evolving. It can be beneficial to reflect on your current relationship with your family and how it connects to these dreams. Consider journaling your thoughts and feelings about your childhood and your family relationships to help process any lingering emotions.

If you feel comfortable, exploring these feelings further with someone you trust or a professional could be a valuable step towards healing and understanding.