Just a heads up: there is no statute of limitations on immigration fraud for the immigrants. If it's discovered at any time in the future all the immigration benefits derived from the fraud will be rolled back and the punishment (which usually includes a ban from entering the US) will be administered. E.g. if they get a green card through AOS and then naturalize and become citizens but their H1B is discovered to be fraudulent at some time in the future then: AOS is invalid since it requires a valid status, then the LPR (green card) is invalid since it's a result of an invalid AOS, then naturalization is invalid since it requires a certain time of being an LPR. So they are stripped of the US citizenship, deported and banned from entering the country ever again.