If you wish to delete your family site on MyHeritage, follow the instructions below:
First, visit your family site. You can do that either by clicking the “My Sites” or “My Family” links. You can only delete a site when you are successfully logged in as the site manager of that site.
In the family site, click on the ‘Settings’ tab, then click on ‘General’ and go to the ‘Administration’ tab. There you will see the ‘Delete your family site’ option.