Family immigration refers to the immigration of members of the family of a permanent resident or US citizen. This type of immigration happens on the basis of the person's relationship to Legal Permanent Resident or US citizen. This relationship status is very important to determine the sponsor of a family member. A US citizen can sponsor his/her spouse, children, parents and siblings but a Green Card holder can only sponsor his/her spouse and children who must be unmarried and must be below the age of 21. This suggests that if you intend to bring in your family members other than your spouse and children, then it is necessary that you should be a citizen of the US.
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Source:
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