Getting Parent object from a child's collision.

I am shooting a bullet at my characters and they have head and body parts. I want to do damage to the player as a whole and not to the individual body parts. I am currently using this script to get the id of the object I’ve collided with how can I do something similar to get the name of the parent of this object?

    private void OnCollisionEnter(Collision collision)
    {
        //checks if the thing hit was a player or something else
        if (collision.gameObject.tag == "Player")
        {
            //gets the body part hit
            hitID = collision.collider.gameObject.name;
            //part that i need help with vvvv
            playerID = collision.collider.gameObject.name;

            //calls the damage player method
            CmdPlayerHit(hitID, playerID, damage);

            //Destroys the projectile when it hits a player
            Destroy(this.gameObject);
        }
        else
        {
            Destroy(this.gameObject);
        }
    }

collision.gameObject.transform.parent.gameObject will give you the parent gameobject of the gameobject colliding with your script’s object.