using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    public GameObject player;

    //Invoked when a button is pressed.
    public void SetParent( GameObject newParent )
    {
  //Makes the GameObject "newParent" the parent of the GameObject "player".
  player.transform.parent = newParent.transform;
   
  //Display the parent's name in the console.
  Debug.Log( "Player's Parent: " + player.transform.parent.name );

  // Check if the new parent has a parent GameObject.
  if( newParent.transform.parent != null )
  {
   //Display the name of the grand parent of the player.
   Debug.Log( "Player's Grand parent: " + player.transform.parent.parent.name );
  }
    }

    public void DetachFromParent( )
    {
  // Detaches the transform from its parent.
  transform.parent = null;
    }
}

using UnityEngine;
using System.Collections;
using Image = UnityEngine.UI.Image;

public class MoveFood : MonoBehaviour {

    Image Food;
    bool MouseDown = false;

    void Start () {
    
    }

    void OnMouseDown() {

        MouseDown = true;
    
    }

    void OnMouseUp() {

        MouseDown = false;
    
    }

    void Update () {

        Vector3 Cursor = Input.mousePosition;

        Cursor = Camera.main.ScreenToWorldPoint(Cursor);

        Cursor.z = -0.09f;

        if (MouseDown)
        {

            this.transform.position = Cursor;

        }

    
    }
}