Allow users to view all posts but only a certain page

Hi everyone,

I’m using WP to run my girlfriends teaching blog/website. What I want to be able to do is post students grades online, in a page specifically for them so their parents can view their grades. The problem with this is that only the parents of that student should be able to view the grades and not the grades of other students. Is there a plugin or a combination of plugins that would allow me to do this or can I hack WP to do this somehow?

Any help would be greatly appreciated.

Jess