Immigrant Visa - Green Card Categories & Information
Great title section
Applicants must qualify on the basis of their abilities in the sciences, arts, education, business or athletics, and must intend to continue working in their field. No labor certification or job offer is required.
Immediate relatives of US Citizen - spouse, minor children (under 21), parents (if citizen is over 21) - are eligible for Green Cards without any waiting period save that involved in processing the application.