Est. Budget: $250.00
In Magento admin page, create a new tab in customer edit page, called "Related Customer", in that page admin view current relationships with other members (in Grid format to show multiple relation).
Admin can add relationship for user, by selecting other customer (by filtering of last name, first name, Email address, phone number) and selecting Relationship (e.g. Closed Friends, co-worker.- which could be defined in config page of the extension)