I have an ibook on my apple book which I want to send to my brother's ipad. Is this possible? It's a photobook which I made and purchased from Blurb, so I own the copyright... If anyone knows this is possible, please let me know how to do it.
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Email it too him. He can tap and hold on the attachment, and as long as he has the iBook app installed it should allow him to Open In that app. You won't be able to email it from iBooks (unless it's a PDF file). You will have to send the book from whatever copy you had before it ended up in the iBook app.

Unless the book is copy protected. Then things get complicated.