continue:
b. When U.S. citizen or permanent resident handle immigration for their minor child, when the child over 13 under 18 years of age:
If over 16 under 18 years of age, can be got 3 years validity permanent resident status.
If over 13 under 16 years of age, according to the age, can be got 4 ,5 or 6 years validity permanent resident status.