What reward does a person receive if he gives charity on behalf of someone else? Does he get the full reward of the charity if it is for someone else, or does its reward go only to the person on whose behalf it was given?

The charity and its reward reach the deceased by the consensus of Muslims, and the one who gives it is rewarded for it. This is indicated by the hadith (definition) of Aisha, may Allah be pleased with her, that a man asked the Prophet, peace and blessings be upon him: "My mother died suddenly, and I think that if she had spoken, she would have given charity. Will I be rewarded if I give charity on her behalf?" He said: "Yes." This indicates the permissibility of giving charity on behalf of the deceased and its benefit for both the deceased and the one who gives the charity.