Dreams about entering dark places where the lights won't turn on can often symbolize feelings of uncertainty, fear, or lack of control in your waking life. Light in dreams often represents clarity, understanding, or knowledge, so the absence of light may indicate that you are feeling confused or lost in a particular situation or relationship.

In your recent dream, the setting of your parents' house and the presence of your brother may point to unresolved issues or tensions within your family dynamic. Since you mentioned that your relationship with your brother is strained, the darkness could symbolize your feelings about that relationship—perhaps a fear of confrontation or a desire to avoid conflict.

The recurring theme of flickering lights or the inability to find other sources of light suggests a pattern in your life where you may feel stuck or unable to find solutions to your problems. This could be a call to explore your feelings more deeply regarding your family and any underlying issues that may be affecting your emotional well-being.

Here are some insights and advice for you:

1. Self-Reflection: Take some time to reflect on your feelings toward your brother and your family. Understanding your emotions can help you find a way to address them.
2. Communication: If possible, consider opening a line of communication with your brother. Sometimes, discussing issues can bring clarity and perhaps help illuminate the "dark" areas of your relationship.
3. Finding Light: In your waking life, look for ways to bring more clarity to situations that feel uncertain. This could involve seeking advice, talking to someone you trust, or finding ways to express your feelings.
4. Journaling: Keep a dream journal to track your recurring dreams and identify any patterns or changes in your feelings about your family. This can help you gain insight into your subconscious thoughts.

By addressing these feelings and seeking clarity, you may find that the darkness in your dreams begins to fade, allowing for more light and resolution in your waking life.