employer must file a Form I-140, Petition for Alien Worker for you. Employment-based immigrant petition: If you want to apply for a Green Card based on your employment, your U.S.For more information, see our Family page. citizen or lawful permanent resident relative must file a Form I-130, Petition for Alien Relative for you. Family-based immigrant petition: If you want to apply for a Green Card based on your family relationship, a U.S.When you know what category you believe best fits your situation, you usually will need someone else to file an immigrant petition for you.