def METHOD_NAME(self):
    """ Recursively add or remove notifiers for the children ObserverGraph.
    """
    for child_graph in self.graph.children:
        for next_object in self.graph.node.iter_objects(self.object):
            add_or_remove_notifiers(
                object=next_object,
                graph=child_graph,
                handler=self.handler,
                target=self.target,
                dispatcher=self.dispatcher,
                remove=self.remove,
            )