As a green card holder, you can sponsor your spouse and unmarried children under or over 21.

You must file Form I-130, Petition for Alien Relative for each qualifying family member.

Once you become a U.S. citizen, you can then sponsor parents, siblings, and married children.

You'll need to file Form I-864 to show you can financially support your family members.

 You must remain a lawful permanent resident to keep the petition valid.