A:
You should keep this worker's money with you until his heirs come and take it, as you know that he has a brother who is going to come, even if a long period of time passes. If you invest this money for him, this will be better. If you can give this money to the Head of the Court in your area and take a receipt, this will be even better and easier for you. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.