Many people get Green Cards (become permanent residents) through family members. You may be eligible to get a Green Card as:

• an immediate relative of a U.S. citizen, this includes spouses, unmarried children under the age of 21, and parents of U.S. citizen petitioners 21 or older
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• a family member of a U.S. citizen fitting into a preference category, this includes unmarried sons or daughters over the age of 21, married children of any age, and brothers and sisters of U.S. citizen petitioners 21 or older
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• a family member of a green card holder, this includes spouses and unmarried children of the sponsoring green card holder
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• a member of a special category, this can include battered spouse or child (VAWA), a K nonimmigrant, a person born to a foreign diplomat in the United States, a V nonimmigrant or a widow(er) of a U.S. Citizen