GREEN CARDS FOR IMMEDIATE RELATIVES
You Might Be Eligible for a green card as an "Immediate Relative" of a US Citizen
Immediate relatives of US citizens are spouses, children, and parents.
There are no green card visa restrictions for immediate relatives. In most cases, immediate relatives will be able to receive their green cards within 6 to 12 months.
USCIS will initially issue a 2 year conditional green card when the marriage of which the petition was based on is less than two years old.
For a child to be considered as an immediate relative, he or she has to be under the age of 21 and unmarried. US citizen parents who file I-130 for their child before their 21st birthday, the child's age will be frozen at 20 years old even though the child will probably be over 21 when she actually receives her green card. Step children and adopted children have special rules.
A US citizen child can sponsor their immediate relative parent if they are at least 21 years old.