how to get parent gameobject in unity

Code Example - how to get parent gameobject in unity

                
                        childObject.transform.parent.gameObject
                    
                
 

parent unity

                        
                                public gameobject player
public gameobject Newparent
player.transform.parent = newParent.transform;
                            
                        
 

unity get component in parent

                        
                                void OnCollisionEnter(Collision collision)
{
PlayerController pl = collision.gameObject.GetComponentInParent<PlayerController>();
}