My wife is completing a I-864 Affidavit of Support for her sister who is immigrating to the U.S. from the Philippines. I am completing a I-864A as well. My question is, as I am combining my income with hers, under Part 1, is my wife considered the 1.a. Petitioner or 1.d. the Only joint sponsor or 1.e. The first of two joint sponsors?