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When can parents visit their relatives when their children have just completed investment immigration to the United States?

If you apply for an ordinary tourist visa, you can visit relatives at any time, valid for ten years, and it is good to stay for no more than three months at a time. The visa expires in ten years and can be extended.

Children can also apply for reunion immigrant visas for their parents, but the time is longer, ranging from 78 to more than ten years.