File access Restriction on Standard User.


Hi again everyone,

I am exploring my Mountain Lion machine. I have two accounts; One admin account for me and one Standard account for my sister. I log in with my sister's standard account and I can open all file and folders in my admin account Home Folder . It means whatever i place in my account are visible by another users.

I want to restrict this permission but so far no luck.
How to do it? Any suggestion would be appreciated.