children doesn't take parent's rotation, position or scale.

So as the title says, I have some gameobjects I want to be children of other gameobjects. However, changing their transforms don't work. The only one that works is the localScale one, but it makes the child have a different size from the one they have when they are not a child.Their rotation is completely random at times, as the inspector says the child is at 0,0,0 when it visually changed by 90º on the X axis. Any help on how to make them take the parents position, rotation or scale is appreciated.

This here is my code.

  private void OnTriggerEnter(Collider col) 
     {
         if ((col.CompareTag("RopaClara") || col.CompareTag("RopaOscura")) && !Ocupado_1)
         {
             col.transform.SetParent(pos_1);
             col.transform.localPosition = new Vector3(0, 0, 0);
             col.transform.rotation = pos_1.rotation;
             //col.transform.localScale = new Vector3(5f, 5f, 5f);
             Debug.Log(col.transform.position);
             Ocupado_1 = true;
 
             if (!Ocupado_2)
             {
                 col.transform.SetParent(pos_2);
                 col.transform.localPosition = pos_2.transform.localPosition;
                 col.transform.localScale = new Vector3(2f, 2f, 2f);
                 Debug.Log(col.transform.position);
                 Ocupado_2 = true;
             }