An interesting submission.
It's great to see so much talent in a flash animator that young, I'm sure he'll bring much needed flavor to this site as he gets older. I thought the concept of the flash was nice, the animation was simple, and you included decent music. Some of the line movements tied into the beat of the music too, that was impressive. I'll have to check out the episodes of this series.
The animation was simple, but I thought you could have at least made it longer since it was basic animation. Granted, I know your brother is four, but I'm sure you could have helped him out with it. Anyway, tell your baby brother to keep up the good work, he is an aspiring animator and I'm sure great succeess is bound to come his way.