Is giving unlawfully acquired money as charity to a needy mother, with the intention of donating it on behalf of its original owner, considered a valid act after repentance?

Unlawful money, if seized without the owner's consent, such as stolen money, must be returned to him or his heirs. If this is impossible, then it should be given in charity on his behalf.

However, if it was seized with the owner's consent and its unlawful counter-value was received (like someone who exchanged it for wine), it should not be returned to him. Rather, it should be given in charity, and the recipient may take from it what he needs if he is in need.

But if it was seized with the owner's consent and its unlawful counter-value was not received (like usury), then the money must be returned to its owner.

Therefore, if the money the questioner gave to his mother is of the kind that must be returned to its owner, then his repentance is not complete until it is returned. If it is not of the kind that must be returned, then giving it to his needy mother is permissible, as it is among the expenditures for the poor and needy.