Hi,
I know this is rather an old thread, and I don't have children.
However, here are a few books I think would be great.
Here are a some ideas:
a gemstones or healing stones book
an aromatherapy book for kids
an simple herbal book with pictures to help them i.d. the plants
an intro book to reiki
a dictionary of new age terms and words
Good luck, Fortuna

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The opinions expressed in my post are only my humble opinions. I expressly request that none of my opinions be taken personally or taken offense to as it is not in my nature to intentionally cause hurt. I am only human and I make mistakes, so please remember this when reading some of my more passionate or lengthy posts. --Fortuna