This dream may symbolize your subconscious desire to uncover hidden aggression or conflicts in your waking life. The act of investigating a crime with someone could represent your efforts to uncover the truth or get to the bottom of a situation. However, the attack in the dream may suggest that you are feeling threatened or attacked in some way. This could be a reflection of a real-life situation where you feel like someone is trying to harm you or sabotage your efforts. The transfer to a different dream where you are in your grandmother’s yard with your cousin may symbolize a sense of familiarity and comfort, as grandmothers often represent nurturing and protection. However, the repeated stabbing by your cousin while your grandmother watches could suggest that you feel betrayed or hurt by someone close to you. The act of defending yourself and stabbing them back may indicate your need to stand up for yourself and protect your own well-being. Overall, this dream may be a reflection of your subconscious processing feelings of aggression, betrayal, and the need to defend yourself in your waking life.