VR - Best method for keeping track of both controllers are interacting with an object.

I want the user to be able to resize objects by "grabbing" it with the trigger button of both controllers.

Here is my current code:

     void OnTriggerStay(Collider other)
     {
         if (device.GetTouch(SteamVR_Controller.ButtonMask.Trigger))
         {
             int interactorCount = other.GetComponent<StateController>().controllerInteractionCount;
             if (interactorCount == 0 || interactorCount == (int)trackedObj.index)
             {
                 // Just this controller so move
                 other.GetComponent<StateController>().controllerInteractionCount = (int)trackedObj.index;
                 other.gameObject.transform.SetParent(this.gameObject.transform);
             }
             else
             {
                 // Both controllers so scale
                 float scale = controllerManager.GetComponent<ControllerManager>().getDistance();
                 other.transform.localScale = new Vector3(scale, scale, scale);
             }
         }
         if (device.GetTouchUp(SteamVR_Controller.ButtonMask.Trigger))
         {
             // No longer pulling trigger so reset
             other.GetComponent<StateController>().controllerInteractionCount -= (int)trackedObj.index;
             other.gameObject.transform.SetParent(null);
         }
     }

It has some bugs in it but it just feels like an inappropriate way to do this. Is there a better approach for doing something like this?