Transform.parent

Description

The parent of the transform.

Changing the parent will modify the parent-relative position, scale and rotation but keep the world space position, rotation and scale the same. See Also: ref::SetParent.

public var player;
//Invoked when a button is pressed.
//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);
}

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
	public GameObject player;

	//Invoked when a button is pressed.
	public void Example(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);
		}
	}
}

Another example:

	// Detaches the transform from its parent.
	transform.parent = null;

	// Detaches the transform from its parent.
	transform.parent = null;