If you (a U.S. citizen or lawful permanent resident) are petitioning for an immigrating husband, wife, parent, child, brother, or sister to receive a U.S. green card, an important part of your role is ensuring that the immigrant will not be found inadmissible as a likely "public charge." Put another way, you'll need to show the U.S. government that your relative will not receive welfare or other need-based public assistance. One important and required way of doing this is to promise that you will support the immigrant at a level above the U.S. Poverty Guidelines, and will reimburse the government for any assistance the immigrant claims for a period of time. Learn more about your obligations here.