Destroy child from parent in array (Child instatiate)

HI, how i can destroy a child that was instatiate, from a parent in a array ? this is a error: Destroy(actualParent.transform.FindChild("actualChild(Clone)").gameObject); the error is: NullReferenceException: Object reference not set to an instance of an object and by this nothing happend: Destroy(actualParent.transform.FindChild("actualChild(Clone)")); or is is better to disable it ?