Dreams involving fire and buildings often symbolize transformation, change, or a sense of destruction. In your dream, the big building could represent your family structure or your current life situation, suggesting that there may be underlying tensions or issues that need addressing. The fire can indicate a cleansing process or an emotional upheaval, where old patterns or conflicts are being confronted.

The possession of people may reflect feelings of being overwhelmed by external pressures or fears that are affecting your family dynamics. The involvement of the Catholic Church might signify a search for guidance, support, or a desire for redemption in a challenging situation. Your grandma issuing apologies could suggest a need for reconciliation or healing within family relationships, while your mom helping you confront a demon indicates a need for support in facing your fears or internal struggles.

Overall, this dream may be urging you to examine any unresolved issues within your family or your own life. It could be helpful to communicate openly with your family members and seek ways to address any conflicts or emotional burdens. Consider what aspects of your life feel chaotic or out of control, and think about how you can bring about positive change.