This dream may represent feelings of betrayal and anger towards a loved one. The party symbolizes a social gathering or celebration, possibly representing a happy or carefree time in your life. However, the banging from the door and the need to check on others suggests a sense of responsibility and concern for those around you. The discovery of your mother having intercourse with someone may reflect feelings of shock and disgust, possibly related to a real-life situation where someone close to you has betrayed your trust. The transformation of the man into a bird may symbolize a loss of power or control in the situation. The plastic bag may represent feelings of suffocation or containment. The act of squeezing the bird until it falls apart may represent a desire to destroy or eliminate the source of your anger and pain. Calling your father and finding your sister crying may suggest a need for support and comfort from your family during this difficult time. The apology to your sister may symbolize a desire to repair any damage caused by your actions. Overall, this dream may reflect feelings of betrayal, anger, and a need for support and resolution in a difficult situation.