How to transform parent object from child?

I have multiple parent objects(all are same) with same name. I want to transform the object(parent) when player enters the trigger(child object). With the code I have I can not move its own parent(as all have the same name). I want only its parent to be transformed.

         private var start : Vector3;
         private var end : Vector3;
         private var moveb : boolean = false;
         var duration : float = 1.0;
         private var startTime : float;
         
        
         
         function Update () {
             if(moveb==true){
                 
                 Debug.Log("got it");
                 GameObject.Find("Box1").transform.position = Vector3.Lerp(start, end, (Time.time - startTime) / duration);
                 if(GameObject.Find("Box1").transform.position==end){
                     moveb=false;
                 }
             }
             
         }
         
         function OnTriggerEnter(other : Collider){
                start = GameObject.Find("Box1").transform.position;
                startTime = Time.time;
                end = start + Vector3(0,0,10);
                moveb=true;
         }
 

Instead of "GameObject.Find("Box1")" which makes some other object to move, I want something that transforms only its parent.