you should tell him that it is public property and not his own book. He should take care as his own belongings. Or if he doesn't listen  the libarain should have a fine for people doing such things.
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I would tell her that watching films is good but there is a limit of everything and she has crossed it and this is harming her studies and i will tell her that if you really like so much to watch films then watch on sundays but in the whole week study sincerely , enjoy your sundays by watching the films infact i would also tell her to watch films which give her knowledge about the world and also teach lessons.
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its a nice way to solve this problem