not really custody, My son is in Qwait, his girlfirend is here in MN with his child. I was wondering on what kind of rights I have as a grandparent?

First, your son only has the right to parenting time if a) the mother agrees, or 2) the court orders it.  You would only obtain rights if a) your son is dead, b) the child has lived with you for 12 months, or 3) you are involved in the action to establish parental rights for your son. Merely being on the birth certificate or signing the Recognition of Parentage (ROP) is insufficient to establish right in your son (they just make him responsible for child support).