Who Can Be Sponsored?
Any U.S. Citizen can sponsor their family members which includes their spouses, children, parents, brothers and sisters, married and unmarried sons and daughters, and adopted children. Green Card holders may only sponsor spouses, children, and unmarried adult sons and daughters.
Immediate family members include your spouse, children and parents and therefore can immigrate to the U.S. as soon as their immigrant visa petition is approved. All other family members must wait for a visa number to become available to them.