Teaching Kids Spirituality

I have three young children. My eldest, who is 6 has been asking a lot about God, Jesus and his Soul. I myself have just discovered the difference between my Ego and Me. I am on the path to Enlightenment and loving the process. I would like to teach my children about Ego, consciousness, Enlightenment etc. I would love your advise on where and how to start with my kids ( books, etc)