Fairy Tale Comforts
When you read a fairy tale and it tells you there are three brothers, you already know about them. it's a given, iconic. The third brother (though an oaf, simpleton or weakling) is going to be the hero. You don't need a lot of meaningful episodes to illustrate the psychological conditions. You don't need any back story. Just get on with it. The first two go out into the world and fuck up. Number three saves the day, gets the princess and the gold, and they all live happily ever after.