Programmatically creating new instances of a controller - angularjs

Question

So here is my problem, I have some functions/variables in a parent controller
function parentController($scope) {
$scope.numberOfChildren = $scope.numberOfChildren + 1 || 1;
console.log($scope.numberOfChildren);
$scope.someFunction = function(argument) {
// do stuff
$scope.someVariable = result of the function
}
}
I am calling this controller in two other controllers that are directives controllers and are called in the same view
function firstChildController ($scope, $controller) {
var aVariable = 1;
$scope.otherVariable = 10;
$controller('parentController', {$scope: $scope});
$scope.someFunction(aVariable);
}
function secondChildController ($scope, $controller) {
var aVariable = 6;
$scope.otherVariable = 11;
$controller('parentController', {$scope: $scope});
$scope.someFunction(aVariable);
}
What I want, is not to share the parent scope for the two children.
Right now, there is only one instance of the parent controller and so when I call two directives depending on it on the same view, I get $scope.numberOfChildren === 2.
What I want is this parent controller to be loaded twice but have separated scopes ($scope.numberOfChildren === 1 in each child controller)
I managed to do this using ng-controller in the view template and deleting the $controller calls but I want to do it programmatically. (I don't want to have to write the same ng-controller code each time I am calling the directive).
<div ng-controller="parentController">
<first-directive></first-directive>
</div>
<div ng-controller="parentController">
<second-directive></second-directive>
</div>
Finally, to keep homogeneity in the code of the project, I'd rather not use the this and vm stuff to do the job if it possible.

Answer 1

parentController does NOT have its own scope, it operates on the $scope you're passing to it when you instantiate it this way $controller('parentController', {$scope: $scope}).
Checkout this simple demo fiddle.
The problem in your case might be caused by directives sharing the same scope and, thus, passing the same scope to the parent controller.

Answer 2

What you expect is exactly same with the way system run: scope is not sharing between two controller.
When you use a ng-controller in html, a new scope (controller instance) will be created. From your code above, two controller instance will be created. You can see it by adding {{$id}} to html and see id of scope instance.
<div ng-controller="parentController">
{{$id}}
<first-directive></first-directive>
</div>
<div ng-controller="parentController">
{{$id}}
<second-directive></second-directive>
</div>
If you see {{numberOfChildren == 2}} mean that your code is wrong in somewhere, not by sharing scope issue.