Hi Lucas,
I was going to create a very similar thread as I work with children mentoring them and working with them in groups too.
I will come back and write some more soon but first off, any child is never too young to begin their journey of personal development. First and foremost you have to remember that he is a child and should be treated accodingly. As much as I think music is a fantastic idea, he must be taught how to "play". It's incredibly important for him as every child needs that experience of play to make sure they develop into confident adults.
Start playing some games with him and have a much fun as possible. I don't have a younger brother but I work with younger children as well as young adults and one thing they share is that interaction through play is crucial.
Like I said, I'll be back with more soon!
