What is the ruling on someone who changed their relative's profession to "unemployed" (mutasabbib) while they are employed, and what should they do to rectify this?

What we understood from the question is that your relative asked you to help him officially change his profession on paper only. If you agreed without knowing the reason for the change, and you thought it was permissible, then there is no blame on you. The ruling on circumventing laws depends on the nature of the law. If it is necessary for achieving public interest, then violating it is forbidden. If it is only recommended, then violating it is disliked. If it is unjust, then there is no harm in violating it, as long as no damage results from that.