unity change position relative to parent
Use transform.localPosition instead of transform.position.
Works the same as transform.position if there is no parent.
Example :
using UnityEngine;
using System.Collections;
public class ExampleClass : MonoBehaviour
{
void Example()
{
// Move the object to the same position as the parent:
transform.localPosition = new Vector3(0, 0, 0);
// Get the y component of the position relative to the parent
// and print it to the Console
print(transform.localPosition.y);
}
}