Dream about a lost sibling refers to obstacles and barriers toward your goals. You are feeling rejected by those around you. You are leaving a meaningless past behind and are thinking for yourself. It is sadly an admonition for an inescapable death. This death may be symbolic to an end to some situation, habit, or relationship in your life. You are either trying to get to your subconscious and access its insights.
A lost sibling dream states a forceful, violent or passionate release of your repressed emotions. Not forgetting where you came from and how you got to where you are today. You will let nothing stand in your way of ambitions and obtaining your goals, even if it means hurting those around you. This is unfortunately togetherness and your need to socialize. You are lacking in your own relationship or circumstances.
If you dreamt about a lost sibling:
You may have realized that certain beliefs or attitudes that you have held relate more to the past than to your present situation, and you are now prepared to do something about this. Although things may not improve overnight, making a start will bring about a significant difference.