Dreams about catching a burglar can often symbolize feelings of violation or fear of losing something important to you. Since you mentioned that it felt like you lived in your grandparents' house, this dream may relate to your feelings about family, memories, or a sense of security tied to your childhood or familial relationships.

Catching the burglar could represent your desire to protect your loved ones or a part of your life that you feel is under threat. It might also reflect your own instincts to safeguard your values, beliefs, or personal space.

Consider what aspects of your life feel vulnerable or in need of protection right now. This dream may be prompting you to reflect on your boundaries and how you can assert yourself in situations where you feel threatened or insecure. Take time to connect with your feelings about family and home, as they may provide further insights into the underlying message of your dream.