How to publish a book for free?

My little brother is 11 years old and he just finished his book: The Dark Nights.
The story is about a trio and it goes to a haunted house and comes back with very magical, scary and bizzare experiences.
The book is actually a novelette (13,000 words).
He wants to self-publish the book.
Which website can do it for free?
He is saying that he needs the book both in print and eBook format.
Can he do that for free?
I think that the print will cost and the eBook will be free, but is there any place or website which will publish books for free?
He needs it only in websites:
kobo
Amazon
Amazon Kindle
iBooks
Barnes&Noble
Lulu
He will either publish all through Lulu or separately.
My dad will edit it.
He just needs a website which can publish print books for free.
He also needs a website which can publish eBooks for free.
Are there websites like those?
Or there is only single which will let you publish eBooks and print books for free?

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