Change Parents Parent from Child

"OnCollision, create a new empty and group the colliding, and collided objects into it."

I have a game object with a child object. The child (clamp) detects collision.

I clone that object

When the child object detects collision (of another clone of same thing), I want it to: - create a new empty game object as a 'group'. - place the parent objects (transforms) of this object and the one touched into that group. That way they'll both be children of that new Group object.

I can't seem to get this working.

 #pragma strict
 
 var clamped:boolean = false;
 var parentScript:DragDrop;
 var coreParent:Transform;
 
 function Start () {
      parentScript = this.transform.parent.GetComponent(DragDrop);
      coreParent = this.transform.parent;
 }
 
 
 function OnTriggerEnter(col:Collider){
     if(col.CompareTag("clamp")) //if tags are matching
     {
         if(clamped == false && parentScript.selected == true)
         {
             var group:GameObject = new GameObject(); //create group
             coreParent = group.transform;//put self into group
             col.gameObject.transform.parent = group.transform;//put collider parent obj into group
         }
         clamped = true; //do this last to lock it.
         
     }
 }