You may Remove or Ban particular people from entering your Home.

To do this, right-click or option-click on their Username in the Address Book OR their opened Remote AV video window and choose:

Remove from here (15 minute time out)
5 day ban from here
60 day ban from here

To allow someone back into your Home, you can open the "Banned Users" folder, right-click or option-click on the name, and select "Remove ban". (You can also drag the name into the  Trash can).  Bans will also expire automatically after the 5 or 60 days. The owner only may also enter the home by the home.username.#### shortcut on the main places list, open the Banned users list, and type the person's name next to the    icon.