Destroy(transform.root.gameObject );

Ok, so I unfortunately hate to post a lot, because through trial and error I can usually get what I want working by reading other peoples help request, and also just working through 10 different ways and eventually finding it.

 var speed = 100;
 
 function Awake ()
 {
     renderer.material.color = Color(Random.value, Random.value, Random.value);
 }
 
 function OnCollisionEnter(collision: Collision)
 {
     if (collision.rigidbody)
     {
         var fixedJoint: FixedJoint = gameObject.AddComponent(FixedJoint);
         fixedJoint.connectedBody = collision.rigidbody;
         
         fixedJoint.breakForce = 1000;
         fixedJoint.breakTorque = 1000;
         if (collision.gameObject.tag == "Projectile")
         {
             Destroy(collision.gameObject);
             Destroy(gameObject);
             Destroy(transform.root.gameObject);
         }
     }
 }

The outcome I want (W$$anonymous$$ch i thought the end line of code would do) is that if i collide with a c$$anonymous$$ld object (a sphere in t$$anonymous$$s case) I want both the c$$anonymous$$ld and the parent, and the projectile to get destroyed, all 3 gone. Thank you. Everyt$$anonymous$$ng is working fine: Hit the parent object, both c$$anonymous$$ld/parent and projectile gone, but when I $$anonymous$$t the c$$anonymous$$ld, only the c$$anonymous$$ld/projectile die.