Can't get a component from a parent!!

In unity I am making a 3D game where tanks are fighting each other for the enemy tank is a blender model that I imported to unity and like one all of the shapes I have made for it are children of the bad tank prefab I made a script that when the bad tank is shot all of the parts get detached and have explosion force added to them so it appears as though the tank is falling apart. In the script I need to get a reference to the parent's script so that it can know when to fall apart I used to do that with GameObject.Find but since I want to spawn a bunch of bad tanks every wave I can't do that I tried many, many, many times and in varying ways to get the script through the GetComponetInParent command but it keeps saying that the object reference is not set to a instance of an object and I don't know what to do. Here is the script.

public class Detach : MonoBehaviour { private BadTankScript badTank; private Rigidbody rb; private Transform explosionPos; // Start is called before the first frame update void Start() { explosionPos = gameObject.transform.parent.parent.transform; badTank = //getting the parent's script here. }

 // Update is called once per frame
 void Update()
 {
     if (badTank.queue == true)
     {
         transform.parent = null;
         rb = GetComponent<Rigidbody>();
         gameObject.AddComponent<Rigidbody>();
         Invoke(nameof(Force), 0.1f);
         Invoke(nameof(Delete), 4);
     }
 }
 void Force()
 {
     rb.AddExplosionForce(2, explosionPos.position, 6, 0.3f, ForceMode.Impulse);
 }
 void Delete()
 {
     Destroy(gameObject);
 }

}`