Over half a million people are granted green cards in the United States with the sponsorship of a relative with legal status. Depending on the status of the sponsor, certain relatives have the opportunity of legally immigrating to the United States. United States citizens can sponsor spouses younger children, adult sons or daughters, parents, and siblings. U.S. permanent residents, however, are limited to only sponsoring spouses, younger children, and unmarried sons and daughters. With the exception of spouses, children, and parents of U.S. citizens who are considered “immediate relatives”, all other relatives are put through a numerically-limited preference system.