I dreamt that I was on holiday with my family and there was a terrorist attack. When we evacuated and got on the plane, we realised we had left our 14 year old sister.
Dreams can have various interpretations and can often be highly subjective. However, based on the details you provided, here is a possible interpretation of your dream:
The dream of being on holiday with your family and experiencing a terrorist attack may symbolize feelings of insecurity, vulnerability, and fear. This could reflect your subconscious concerns about the safety and well-being of your loved ones, especially in unfamiliar or unpredictable situations.
The fact that you left your 14-year-old sister behind during the evacuation suggests a sense of responsibility or guilt. It may indicate feelings of neglect or concern about leaving someone vulnerable or defenseless behind. Alternatively, it could symbolize a fear of losing or failing to protect a loved one in some aspect of your waking life.
Overall, this dream might be reflecting your deep concern for the safety and protection of your family members. It could be worth exploring any underlying anxieties or stressors that could be contributing to these feelings as you seek to ensure the well-being of your loved ones.