smilarly all the users can acces the parent site as it is a anonymous site.
In a blog, all users will(User1,User2,....User4) post their posts,
a. Post should display to users which are created by themselves only. like [Me]
b. Supervisor 1 should able to see User 1 and User 2 posts only not to User 3 User 4 posts, like the way Supervisor 2 should able to see User 3 and User 4 posts only.
c. Administrator should see all user posts.