Quote Quoting T53147
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NO. He may not enter as a tourist with immigrant intent (AOS). Your father should become a citizen and then sponsorship of a stepchild is easy and relatively quick. As LPR there is a wait. This lists the requirements for sponsorship of children. Age of child is significant.

http://www.uscis.gov/family/family-u...nent-residents

What about the child's mother?

If he is going to study, he needs an F-1.
The mother is an alien. My father is not eligible to become citizen yet. I guess my stepbrother will have to wait.