[Backbone router] Child route to trigger parent route action as well

script.js

(function() {
  "use strict";

  var MyRouter = Backbone.Router.extend({
    routes: {
      "/"                       : "home",
      "user/:username"          : "profilePage",
      "user/:username/following": "following",
      "user/:username/followers": "followers"
    },

    home: function() {
      console.log("welcome to the homepage");
    },

    profilePage: function() {
      console.log("this is your profile");
    },

    following: function() {
      console.log("these are the users you are following");
    },

    followers: function() {
      console.log("these are your followers");
    }
  });

  var appRouter = new MyRouter();
  appRouter.on("route:following route:followers", function() {
    console.log("Trigger the /user route as well");
  });

  Backbone.history.start();

})();

There are other solutions to this problem on stackoverflow but most people recommend using backbone.marionette which fixes a lot of "issues" concerning view handling in Backbone