C# find objects of type and store them in a array

Hi!

I been trying to figure this out for a very long time now without any real success. Similar questions have been asked which inspired me with good ideas for this script, but I still get some errors.

In my code i create new object and connect them to a parent. Right now a new parent is created for every new object. which is bad. I want to make sure that no new parent is created if a parent with a part of a certain name already exist. If it do exist I want to make that object the parent of the child. The actual script is longer but remove all parts that not relevant to this question.

     private GameObject[] findParentContainer; 
     private GameObject parentContainer; 
     private GameObject child;
 
  void Start() 
 {
 findParentContainer = FindObjectsOfType(GameObject) as GameObject[];
 
 }
 
 public void Update(){
 
    if (inputWeapon.Equals("gun")){

    //Create a the new child 'PoolObjectGun', which need a 'gunContainer' parent
    child = (GameObject)Instantiate(PoolObjectGun); 
    parentContainer = LookForParent("gun");

   }     else if (inputWeapon.Equals("rifle")){
                     
     child = (GameObject)Instantiate(PoolObjectRifle);
     parentContainer =LookForParent("rifle");

     } else if (inputWeapon.Equals("shotgun")){
                     
     child = (GameObject)Instantiate(PoolObjectShotgun);
      parentContainer  = LookForParent("shotgun");
     }

 //method that receives child name and returns its parent
  private GameObject LookForParent (string s){
 GameObject parent; 
     for (var i=0; i < findParentContainer.Count; i++){
             if(findParentContainer[i].name.Contains("'s Pool")){
                 parent = findParentContainer[i]; //the found object at index i
             }
         }
 return parent;

} }