The direct line son or daughter is an United States citizen or owns green cards , 18 annual full one full years of life, do whose parents mind applying for a green card , how longtime necessaries is?

• 您的位置：我也知道>教育/科学>直系子女是美国公民或拥有绿卡,年满18周岁,其父母可否申请绿卡,需多长时间?