Getting a green card is not a simple process, but being an immediate relative of a U.S. citizen is the easiest way to get one. This includes spouses, unmarried children under the age of 21, and parents of citizens. Immediate relative green cards are unlimited. More distant relatives and employees of U.S. companies are limited and are awarded by order of preference. Other categories, such as asylum seekers, religious workers, and the like are issued under special circumstances and with certain qualifications that must be met. Learn more about getting a green card in these Avvo guides.