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Your older brother's told you that you're their sister's keeper. This means that they rely on you to look after yours and their sister.
http://www.bookrix.com/_title-en-mary-h-collins-my-sister-039-s-keeper
then just click read book button
The book 'My Sister's Keeper' is rated M.
'My Sister's Keeper' was written by Jody Picault .