必須公民後才行，綠卡隻能sponsor配偶和未婚未婚子女

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If the sponsor is a U.S. Citizen, they may petition for the following foreign national relatives to immigrate to the U.S:
o
Hu*****and or wife
o
Unmarried child under 21 years of age
o
Unmarried son or daughter over 21
o
Married son or daughter of any age
o
Brother or sister, if the sponsor is at least 21 years old, or
o
Parent, if the sponsor is at least 21 years old.
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If the sponsor is a lawful permanent resident, they may petition for the following foreign national relatives to immigrate to the U.S.:
o
Hu*****and or wife, or
o
Unmarried son or daughter of any age.