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.