This dream seems to reflect a complex mix of emotions and themes related to family, inheritance, and the unknown. Here are some interpretations of the key elements:

1. Inheriting the House: The house represents your father's lineage and the legacy of family. It could symbolize unresolved issues or emotions related to family dynamics, especially after the passing of relatives.
2. The Odd Aura: The strange feeling in the house might indicate that there are lingering emotions or memories that need to be addressed. It could suggest that your family history carries both value and complexity.
3. The Locked Room and Ghosts: The locked room can symbolize hidden aspects of your family history or unresolved family issues. The ghosts, particularly those of your grandmother and Maurice, may represent memories or feelings that are haunting you. Their taunting could suggest feelings of guilt, fear, or unresolved conflicts in your family.
4. Disguise and Recognition: The ghost pretending to be your father but having a visible flaw (the cast) indicates that there may be aspects of your father or your relationship with him that you feel are not genuine or fully understood. It highlights the importance of recognizing the truth behind appearances.
5. The Friend's Warning: Your father's friend sensing danger and advising you to run could symbolize your own instinctive awareness that confronting these family issues might be overwhelming or frightening. It suggests a need to protect yourself from potential emotional harm.

Overall, this dream seems to encourage you to confront aspects of your family history that may be troubling you. It may be beneficial to reflect on your feelings about your family relationships and consider whether there are unresolved issues that need to be addressed. Talking about these feelings with someone you trust might help bring clarity and peace.