The provisions of the United States immigration law include two categories of family-based immigrant visas, Immediate Relative and Family Preference, which can lead to a Green Card through marriage. Immediate Relative Immigrant Visas are granted to those who have a close family relationship with a US citizen, such as spouses, unmarried children under 21 years of age, orphans adopted by a US citizen, and parents of US citizens who are at least 21 years old. These visas are not limited each fiscal year, allowing more people to get a Green Card through marriage. Meanwhile, Family Preference Immigrant Visas cater to more distant family relationships, such as unmarried/married sons and daughters of US citizens, brothers and sisters of US citizens, and spouses, minor children, and unmarried sons and daughters of Lawful Permanent Residents. However, this category has numerical limitations on family preference immigrants seeking a Green Card through marriage.