Dreaming about the death of parents can be quite intense and often reflects deep emotional processing rather than literal interpretations. In your case, the transformation of your mother into your grandmother may symbolize unresolved feelings or issues related to your familial relationships, particularly with your mother.

This dream could indicate a desire to confront and process the trauma from your past. It might suggest that you are grappling with your identity and how your family's history has shaped you. The presence of your grandmother's face could represent a longing for nurturing or a different kind of maternal support, possibly indicating a need for healing and understanding.

Consider reflecting on the feelings that arose during the dream and upon waking. This might help you understand what aspects of your relationship with your parents you are currently processing. Additionally, it could be beneficial to explore these feelings further, perhaps through journaling or speaking with a trusted friend or therapist, to work towards healing and closure.