Dreams involving family members often reflect your feelings about your relationships with them or your role within the family. In this dream, taking your siblings to a bar might symbolize a desire for connection or a way to explore new experiences together. Your sister appearing as a baby could indicate a sense of protectiveness or a view of her that highlights her vulnerability, despite being an adult.

Your brother's return with injuries could signify worries you have about him or concerns about his well-being, possibly reflecting feelings of helplessness when faced with his challenges. The dirt and burns might represent struggles he is facing in life or the consequences of choices he has made.

Overall, this dream could be prompting you to consider your family dynamics, your protectiveness over your siblings, and any concerns you might have about their lives. It may be helpful to check in with them in waking life to ensure they are doing well and to strengthen your bond.