A U.S. citizen may petition to bring a child to live and work in the United States permanently, regardless of the child's age or marital status. A lawful permanent resident may only petition for an unmarried child of any age.

If you had children before you became a permanent resident, your children may be eligible to receive following-to-join benefits. This means that you would not have to submit a separate USCIS Form I-130 (Petition for Alien Relative) for your children, and your children will not have to wait any extra time for a visa number to become available.

Please note that if you are a U.S. citizen, you do not need to file separate visa petitions for the unmarried, minor children of your unmarried child over the age of 21. You also do not need to file separate visa petitions for the spouse or unmarried, minor children of your married child of any age. If you are a legal permanent resident, you do not need to file separate visa petitions for the unmarried, minor children of your unmarried child.

You should also be prepared to prove that you meet the income requirement of a sponsor. Your household income should be sufficient to support your family at 125% or more above the U.S. poverty level for your household size.