AngularJS: Protoypical Inheritance

HTML

<script src="http://ci.angularjs.org/job/angular.js-angular-master/ws/build/angular.js"></script>
<div ng-controller="Parent">
  Data length: {{ data.length }}<br>
<div ng-controller="Child">
   
</div>
</div>

JavaScript

function Parent($scope) {
    $scope.data = [];
}

function Child($scope) {
    
    $scope.data.push({id:1}); 
    $scope.data.push({id:2});
 
}