Dreams often reflect our subconscious thoughts, feelings, and experiences. In your dream, several elements stand out that can provide insights into your current state of mind and emotions.

1. Twin Cousins: The presence of your cousins might symbolize your relationships with family or friends, possibly representing a desire for connection or companionship. Twins can signify duality, so this could also reflect aspects of yourself or situations in your life that feel mirrored or similar.
2. Searching for a Towel: The act of looking for a towel with spotted designs might symbolize a desire for comfort or protection. Towels are often associated with cleanliness and drying off from emotional experiences. The spotted designs could represent individuality or uniqueness in the comfort you seek.
3. Old Soup: Finding the soup you made years ago may indicate nostalgia or a reflection on past experiences. It could signify that you're revisiting memories or feelings from that time in your life, perhaps related to comfort or security.
4. Dining Table Setting: The setting of a dining table suggests gathering, sharing, and nourishment, both physical and emotional. The fact that it felt better than your real-life home might indicate a longing for a more fulfilling or ideal environment.
5. Laughter with Your Brother: Sharing laughter with your brother signifies a close bond and perhaps a moment of lightheartedness in your life. This can represent a need or desire for support and joy during your current challenges.
6. Grade 12 Mention: The mention of being in Grade 12, despite currently being in Grade 11, could symbolize your aspirations, ambitions, or feelings of pressure about growing up and facing future responsibilities. It might reflect your thoughts about moving forward and preparing for what comes next in your academic or personal life.

Overall, your dream seems to reflect a blend of nostalgia, a desire for comfort and connection, and considerations about your current life phase and future aspirations. It may be helpful to think about what aspects of your life you wish to enhance or change as you move forward.