$parent not working in ng-include angular

I am changing value of variable inside child controller using $scope.$parent but change is not reflecting to its parent.

<div data-ng-if="!addBillDetails">
    <button class="btn btn-small" data-ng-if="trItem.skuId==217"
            data-ng-click="addDetails()">Add Details</button>
</div>
<div data-ng-if="addBillDetails" data-ng-include="'views/test.html'"></div>

$scope.addDetails=function(){
                $scope.addBillDetails=true;
};

test.html and testCrl

<div data-ng-controller="testCtrl">
<button type="button" class="btn red" data-ng-click="cancel()">Cancel</button>
    </form>
</div>

$scope.cancel=function(){
   alert("cancel");
  $scope.$parent.addBillDetails=false;
};