What is the expiation for performing sorcery on one's brother to rid him of drugs and alcohol, and what should be done regarding the owner of the unknown grave where the sorcery was placed, given the desire for repentance?

Whoever practices magic or goes to a sorcerer has committed a grave sin, one of the seven destructive sins. And whoever goes to a soothsayer or a sorcerer and believes him has disbelieved in what was revealed to Muhammad, peace and blessings be upon him. The duty is to repent from what has passed. If it is difficult to destroy the magic, then you must perform ruqyah (Islamic exorcism) on the enchanted person with legal ruqyah without informing him, and the effect of the magic will disappear by the will of Allah. As for violating the sanctity of an unknown grave by digging it up or similar acts, you must repent and increase your righteous deeds.