I love that they are best friends. Yes, they bicker and argue sometimes like any other siblings on the planet. But they also have a deep love for each other. They do everything together - play, explore, learn...They even prefer to share a room, so that they can stay close. Tonight as they finished reading a few books and got ready to climb into bed they gave each other a big huge hug and big huge kiss and said "I love you, good night!" Can't beat that.