Here are the two family-based immigrant visas:
Immediate Relative – with this visa you the sponsor must be a spouse, child, or parent with U.S citizenship.
Family preference – with this visa it can be an extended family who can sponsor if they are a U.S citizen or a lawful permanent resident (LPR).
Note that a US Citizen can ONLY file a petition for their:
Son or daughter
Brother or sister (if the U.S. citizen is 21 years of age and older)
Note that a US Lawful Permanent Resident can ONLY file a petition for their:
Unmarried son or daughter