Reply

我是美国公民，想给国内的父亲申请移民，父亲国内有个13岁的女儿，（我们同父异母）

妹妹可以一起和父亲申请移民吗？

-No. You need to file another I-130 for your sister, but it takes more than 10 years. The best way is that after your father gets his green card, he can file I-130 to sponsor his daughter (yoru sister), and you can be the joint sponsor to provide the financial support. 

父亲的第二次婚姻出问题，女方自己离开，孩子不管了。所以，想让小妹妹一起过来。

谢谢。