ActionScript 3.0 :: Creating Object Inside Another Object?

is it possible to create instance inside method of another instance? But I want new instance to be sibling of instance where it was created.something like this:

ActionScript Code:
parent = new Parent();
childA = new Child();
parent.addChild(childA);

Child class would have this onclick event function:

ActionScript Code:
public function child_click(e:MouseEvent):void {
childB = new Child();
}

I want "childB" to be child of "parent", no property of childA. so I could do:

ActionScript Code:
parent.addChild(childB);

how is this possible without passing "parent" instance as parameter?