How to use Instantiate() to duplicate objects in "father object"?

When I use Instantiate() to create an object,the object always create in the “root”,
like : Image1
but I want these objects in one Father Object,like: Image2
How Can I do that?Thanks…

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var parent : Transform;

function Start(){
    var clone : GameObject = Instantiate( gameObject );
    clone.transform.parent = parent;
}