I want to sponsor my son in law.What will I be responsible for?

From I-864 is a contract between a sponsor and the U.S.Government. Completing and signing this form makes you the sponsor. You must show on this form that you have enough income and/or assets to maintain the intending immigrant(s) and the rest of your household at 125 percent of the Federal Poverty Guidelines. By signing Form I-864, you are agreeing to use your resources to support the intending immigrant(s) named in this form, if it becomes necessary. The submission of this form may make the sponsored immigrant ineligible for certain Federal, State, or local means-tested public benefits, because an agency that provides means-tested public benefits will consider your resources and assets as available to the sponsored immigrant in determining his or her eligibility for the program. If the immigrant sponsored in this affidavit does receive one of the designated Federal, State or local means-tested public benefits, the agency providing the benefit may request that you repay the cost of those benefits. That agency can sue you if the cost of the benefits provided is not repaid. Yes, he can purchase health insurance. For a better understanding on the consequences of signing the affidavit of support, consult an experienced immigration attorney. Good luck.

I agree.

If you are talking about the Affidavit of Support, I agree with my colleagues. If you are talking about petitioning him, then the answer would be no. You should retain an experienced immigration lawyer to review all the facts and advise you accordingly.