You may be concerned with 8 USC § 1324 but because you're undergoing the legal process (presumably the I-130 Petition has been approved and you're in the process of AOS), you should be okay.
Alvaro De La Calle Calle Law, PLLC (336) 610-5000 www.AsheboroImmigrationAttorney.com www.GreensboroImmigrationAttorney.com
NYC EXPERIENCED IMMIGRATION ATTORNEYS www.myattorneyusa.com; email: firstname.lastname@example.org; Phone: (866) 456-8654; Fax: 212-964-0440; Cell: 212-202-0325. The information contained in this answer is provided for informational purposes only, and should not be construed as legal advice on any subject matter.
Affidavits of Support are contracts with the US government wherein the person who signed them agrees to reimbures the Federal government for the costs of certain means tested benefits, if the immigrant requires and is given those benefits. The US government can sue to obtain that reimbursement.
Affidavits of Support cannot be withdrawn once accepted by the government. They remain in effect until one of the following events take place:
1. The person for whom it was filed has legally worked for 40 quarters in the US.
2. The person for whom it was filed becomes a US citizen.
3. The person for whom it was filed permanently leaves the US.
4. The person for whom it was filed dies.
5. The person who submitted the Affidavit of Support dies.
J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature and does not constitute legal advice, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship. Answers on Avvo can only be general ones, as specific answers would require knowledge of all the facts. As such, they may or may not apply to the question.
The probabilities of USCIS chasing your parents-in-law are very minimal. I have found San Antonio USCIS Officers to be common sense about cases. Improve your case by hiring counsel to help you and attend interview with you and wife.
Your wife's parent has to read the I-864 before they sign the form.
This answer is of a general nature and should not be relied upon as final, nor is it intended as legal advice. Consult with a qualified attorney before making any legal decisions. Gen Kimura, (832) 247-6932.