父母持b1 b2 签证 入境后多久可以办绿卡 是60天 还是90天
-Had better more than 2 months.
另外给父亲单独办理 如何证明父子关系？谢谢
-Provide the copy of your birth certitifcate which shows your father's and your mother's names. Your father also needs to provide his marriage certifificate indicting that you were born after he married your mother.
