Your dream is rich with imagery and unique scenarios, reflecting various aspects of your subconscious mind. Here are some interpretations of the key elements:

1. Claire and the Mansion: Claire represents an ideal or aspiration in your life, possibly tied to romantic feelings or admiration. The mansion symbolizes abundance and luxury, suggesting that you may feel a desire for a more extravagant or fulfilling life, particularly in your relationships.
2. Swimming Pools: The presence of multiple pools indicates a range of emotions and experiences. The lazy river could symbolize a desire for relaxation and ease, while the idea of a Nerf war suggests a playful or competitive aspect of your personality. It may reflect your current state of mind—wanting to enjoy life while dealing with challenges.
3. Conversation with Your Mum: This part of the dream could point to feelings of confusion or a desire for clarity in your life. Your mother’s responses might indicate a need for acceptance of your current state, suggesting that dreaming (or engaging with your subconscious) is an essential part of growth and understanding.
4. Brother and Fortnite: The imagery of living in Fortnite with your brother shows a blend of reality and gaming, indicating a desire for escapism or creativity in your life. The dynamic between you two might reflect your real-life relationship, highlighting themes of support and competition.
5. Peter Griffin and the Gunman: This scene introduces elements of humor and danger. Peter Griffin represents a lighthearted approach to challenges, while the gunman may symbolize underlying fears or threats in your waking life. Your leap of faith signifies courage and a willingness to confront these fears, even if they are subtle or unrecognized.

Overall, your dream suggests a blend of aspirations, relationships, and the balance between playfulness and seriousness in your life. It may be beneficial to explore your feelings about Claire and your current life situation, as well as reflect on how you handle competition and challenges. Embrace the creative aspects of your dreams, as they can provide insights into your waking life.